feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

15 files changed, 4953 insertions, 0 deletions

diff --git a/vanilla/node_modules/undici/lib/dispatcher/agent.js b/vanilla/node_modules/undici/lib/dispatcher/agent.js
new file mode 100644
index 0000000..939b0ad
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/agent.js
@@ -0,0 +1,158 @@
+'use strict'
+
+const { InvalidArgumentError, MaxOriginsReachedError } = require('../core/errors')
+const { kClients, kRunning, kClose, kDestroy, kDispatch, kUrl } = require('../core/symbols')
+const DispatcherBase = require('./dispatcher-base')
+const Pool = require('./pool')
+const Client = require('./client')
+const util = require('../core/util')
+
+const kOnConnect = Symbol('onConnect')
+const kOnDisconnect = Symbol('onDisconnect')
+const kOnConnectionError = Symbol('onConnectionError')
+const kOnDrain = Symbol('onDrain')
+const kFactory = Symbol('factory')
+const kOptions = Symbol('options')
+const kOrigins = Symbol('origins')
+
+function defaultFactory (origin, opts) {
+  return opts && opts.connections === 1
+    ? new Client(origin, opts)
+    : new Pool(origin, opts)
+}
+
+class Agent extends DispatcherBase {
+  constructor ({ factory = defaultFactory, maxOrigins = Infinity, connect, ...options } = {}) {
+    if (typeof factory !== 'function') {
+      throw new InvalidArgumentError('factory must be a function.')
+    }
+
+    if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
+      throw new InvalidArgumentError('connect must be a function or an object')
+    }
+
+    if (typeof maxOrigins !== 'number' || Number.isNaN(maxOrigins) || maxOrigins <= 0) {
+      throw new InvalidArgumentError('maxOrigins must be a number greater than 0')
+    }
+
+    super()
+
+    if (connect && typeof connect !== 'function') {
+      connect = { ...connect }
+    }
+
+    this[kOptions] = { ...util.deepClone(options), maxOrigins, connect }
+    this[kFactory] = factory
+    this[kClients] = new Map()
+    this[kOrigins] = new Set()
+
+    this[kOnDrain] = (origin, targets) => {
+      this.emit('drain', origin, [this, ...targets])
+    }
+
+    this[kOnConnect] = (origin, targets) => {
+      this.emit('connect', origin, [this, ...targets])
+    }
+
+    this[kOnDisconnect] = (origin, targets, err) => {
+      this.emit('disconnect', origin, [this, ...targets], err)
+    }
+
+    this[kOnConnectionError] = (origin, targets, err) => {
+      this.emit('connectionError', origin, [this, ...targets], err)
+    }
+  }
+
+  get [kRunning] () {
+    let ret = 0
+    for (const { dispatcher } of this[kClients].values()) {
+      ret += dispatcher[kRunning]
+    }
+    return ret
+  }
+
+  [kDispatch] (opts, handler) {
+    let key
+    if (opts.origin && (typeof opts.origin === 'string' || opts.origin instanceof URL)) {
+      key = String(opts.origin)
+    } else {
+      throw new InvalidArgumentError('opts.origin must be a non-empty string or URL.')
+    }
+
+    if (this[kOrigins].size >= this[kOptions].maxOrigins && !this[kOrigins].has(key)) {
+      throw new MaxOriginsReachedError()
+    }
+
+    const result = this[kClients].get(key)
+    let dispatcher = result && result.dispatcher
+    if (!dispatcher) {
+      const closeClientIfUnused = (connected) => {
+        const result = this[kClients].get(key)
+        if (result) {
+          if (connected) result.count -= 1
+          if (result.count <= 0) {
+            this[kClients].delete(key)
+            if (!result.dispatcher.destroyed) {
+              result.dispatcher.close()
+            }
+          }
+          this[kOrigins].delete(key)
+        }
+      }
+      dispatcher = this[kFactory](opts.origin, this[kOptions])
+        .on('drain', this[kOnDrain])
+        .on('connect', (origin, targets) => {
+          const result = this[kClients].get(key)
+          if (result) {
+            result.count += 1
+          }
+          this[kOnConnect](origin, targets)
+        })
+        .on('disconnect', (origin, targets, err) => {
+          closeClientIfUnused(true)
+          this[kOnDisconnect](origin, targets, err)
+        })
+        .on('connectionError', (origin, targets, err) => {
+          closeClientIfUnused(false)
+          this[kOnConnectionError](origin, targets, err)
+        })
+
+      this[kClients].set(key, { count: 0, dispatcher })
+      this[kOrigins].add(key)
+    }
+
+    return dispatcher.dispatch(opts, handler)
+  }
+
+  [kClose] () {
+    const closePromises = []
+    for (const { dispatcher } of this[kClients].values()) {
+      closePromises.push(dispatcher.close())
+    }
+    this[kClients].clear()
+
+    return Promise.all(closePromises)
+  }
+
+  [kDestroy] (err) {
+    const destroyPromises = []
+    for (const { dispatcher } of this[kClients].values()) {
+      destroyPromises.push(dispatcher.destroy(err))
+    }
+    this[kClients].clear()
+
+    return Promise.all(destroyPromises)
+  }
+
+  get stats () {
+    const allClientStats = {}
+    for (const { dispatcher } of this[kClients].values()) {
+      if (dispatcher.stats) {
+        allClientStats[dispatcher[kUrl].origin] = dispatcher.stats
+      }
+    }
+    return allClientStats
+  }
+}
+
+module.exports = Agent
diff --git a/vanilla/node_modules/undici/lib/dispatcher/balanced-pool.js b/vanilla/node_modules/undici/lib/dispatcher/balanced-pool.js
new file mode 100644
index 0000000..d53a269
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/balanced-pool.js
@@ -0,0 +1,216 @@
+'use strict'
+
+const {
+  BalancedPoolMissingUpstreamError,
+  InvalidArgumentError
+} = require('../core/errors')
+const {
+  PoolBase,
+  kClients,
+  kNeedDrain,
+  kAddClient,
+  kRemoveClient,
+  kGetDispatcher
+} = require('./pool-base')
+const Pool = require('./pool')
+const { kUrl } = require('../core/symbols')
+const { parseOrigin } = require('../core/util')
+const kFactory = Symbol('factory')
+
+const kOptions = Symbol('options')
+const kGreatestCommonDivisor = Symbol('kGreatestCommonDivisor')
+const kCurrentWeight = Symbol('kCurrentWeight')
+const kIndex = Symbol('kIndex')
+const kWeight = Symbol('kWeight')
+const kMaxWeightPerServer = Symbol('kMaxWeightPerServer')
+const kErrorPenalty = Symbol('kErrorPenalty')
+
+/**
+ * Calculate the greatest common divisor of two numbers by
+ * using the Euclidean algorithm.
+ *
+ * @param {number} a
+ * @param {number} b
+ * @returns {number}
+ */
+function getGreatestCommonDivisor (a, b) {
+  if (a === 0) return b
+
+  while (b !== 0) {
+    const t = b
+    b = a % b
+    a = t
+  }
+  return a
+}
+
+function defaultFactory (origin, opts) {
+  return new Pool(origin, opts)
+}
+
+class BalancedPool extends PoolBase {
+  constructor (upstreams = [], { factory = defaultFactory, ...opts } = {}) {
+    if (typeof factory !== 'function') {
+      throw new InvalidArgumentError('factory must be a function.')
+    }
+
+    super()
+
+    this[kOptions] = opts
+    this[kIndex] = -1
+    this[kCurrentWeight] = 0
+
+    this[kMaxWeightPerServer] = this[kOptions].maxWeightPerServer || 100
+    this[kErrorPenalty] = this[kOptions].errorPenalty || 15
+
+    if (!Array.isArray(upstreams)) {
+      upstreams = [upstreams]
+    }
+
+    this[kFactory] = factory
+
+    for (const upstream of upstreams) {
+      this.addUpstream(upstream)
+    }
+    this._updateBalancedPoolStats()
+  }
+
+  addUpstream (upstream) {
+    const upstreamOrigin = parseOrigin(upstream).origin
+
+    if (this[kClients].find((pool) => (
+      pool[kUrl].origin === upstreamOrigin &&
+      pool.closed !== true &&
+      pool.destroyed !== true
+    ))) {
+      return this
+    }
+    const pool = this[kFactory](upstreamOrigin, Object.assign({}, this[kOptions]))
+
+    this[kAddClient](pool)
+    pool.on('connect', () => {
+      pool[kWeight] = Math.min(this[kMaxWeightPerServer], pool[kWeight] + this[kErrorPenalty])
+    })
+
+    pool.on('connectionError', () => {
+      pool[kWeight] = Math.max(1, pool[kWeight] - this[kErrorPenalty])
+      this._updateBalancedPoolStats()
+    })
+
+    pool.on('disconnect', (...args) => {
+      const err = args[2]
+      if (err && err.code === 'UND_ERR_SOCKET') {
+        // decrease the weight of the pool.
+        pool[kWeight] = Math.max(1, pool[kWeight] - this[kErrorPenalty])
+        this._updateBalancedPoolStats()
+      }
+    })
+
+    for (const client of this[kClients]) {
+      client[kWeight] = this[kMaxWeightPerServer]
+    }
+
+    this._updateBalancedPoolStats()
+
+    return this
+  }
+
+  _updateBalancedPoolStats () {
+    let result = 0
+    for (let i = 0; i < this[kClients].length; i++) {
+      result = getGreatestCommonDivisor(this[kClients][i][kWeight], result)
+    }
+
+    this[kGreatestCommonDivisor] = result
+  }
+
+  removeUpstream (upstream) {
+    const upstreamOrigin = parseOrigin(upstream).origin
+
+    const pool = this[kClients].find((pool) => (
+      pool[kUrl].origin === upstreamOrigin &&
+      pool.closed !== true &&
+      pool.destroyed !== true
+    ))
+
+    if (pool) {
+      this[kRemoveClient](pool)
+    }
+
+    return this
+  }
+
+  getUpstream (upstream) {
+    const upstreamOrigin = parseOrigin(upstream).origin
+
+    return this[kClients].find((pool) => (
+      pool[kUrl].origin === upstreamOrigin &&
+      pool.closed !== true &&
+      pool.destroyed !== true
+    ))
+  }
+
+  get upstreams () {
+    return this[kClients]
+      .filter(dispatcher => dispatcher.closed !== true && dispatcher.destroyed !== true)
+      .map((p) => p[kUrl].origin)
+  }
+
+  [kGetDispatcher] () {
+    // We validate that pools is greater than 0,
+    // otherwise we would have to wait until an upstream
+    // is added, which might never happen.
+    if (this[kClients].length === 0) {
+      throw new BalancedPoolMissingUpstreamError()
+    }
+
+    const dispatcher = this[kClients].find(dispatcher => (
+      !dispatcher[kNeedDrain] &&
+      dispatcher.closed !== true &&
+      dispatcher.destroyed !== true
+    ))
+
+    if (!dispatcher) {
+      return
+    }
+
+    const allClientsBusy = this[kClients].map(pool => pool[kNeedDrain]).reduce((a, b) => a && b, true)
+
+    if (allClientsBusy) {
+      return
+    }
+
+    let counter = 0
+
+    let maxWeightIndex = this[kClients].findIndex(pool => !pool[kNeedDrain])
+
+    while (counter++ < this[kClients].length) {
+      this[kIndex] = (this[kIndex] + 1) % this[kClients].length
+      const pool = this[kClients][this[kIndex]]
+
+      // find pool index with the largest weight
+      if (pool[kWeight] > this[kClients][maxWeightIndex][kWeight] && !pool[kNeedDrain]) {
+        maxWeightIndex = this[kIndex]
+      }
+
+      // decrease the current weight every `this[kClients].length`.
+      if (this[kIndex] === 0) {
+        // Set the current weight to the next lower weight.
+        this[kCurrentWeight] = this[kCurrentWeight] - this[kGreatestCommonDivisor]
+
+        if (this[kCurrentWeight] <= 0) {
+          this[kCurrentWeight] = this[kMaxWeightPerServer]
+        }
+      }
+      if (pool[kWeight] >= this[kCurrentWeight] && (!pool[kNeedDrain])) {
+        return pool
+      }
+    }
+
+    this[kCurrentWeight] = this[kClients][maxWeightIndex][kWeight]
+    this[kIndex] = maxWeightIndex
+    return this[kClients][maxWeightIndex]
+  }
+}
+
+module.exports = BalancedPool
diff --git a/vanilla/node_modules/undici/lib/dispatcher/client-h1.js b/vanilla/node_modules/undici/lib/dispatcher/client-h1.js
new file mode 100644
index 0000000..ce6b4ee
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/client-h1.js
@@ -0,0 +1,1606 @@
+'use strict'
+
+/* global WebAssembly */
+
+const assert = require('node:assert')
+const util = require('../core/util.js')
+const { channels } = require('../core/diagnostics.js')
+const timers = require('../util/timers.js')
+const {
+  RequestContentLengthMismatchError,
+  ResponseContentLengthMismatchError,
+  RequestAbortedError,
+  HeadersTimeoutError,
+  HeadersOverflowError,
+  SocketError,
+  InformationalError,
+  BodyTimeoutError,
+  HTTPParserError,
+  ResponseExceededMaxSizeError
+} = require('../core/errors.js')
+const {
+  kUrl,
+  kReset,
+  kClient,
+  kParser,
+  kBlocking,
+  kRunning,
+  kPending,
+  kSize,
+  kWriting,
+  kQueue,
+  kNoRef,
+  kKeepAliveDefaultTimeout,
+  kHostHeader,
+  kPendingIdx,
+  kRunningIdx,
+  kError,
+  kPipelining,
+  kSocket,
+  kKeepAliveTimeoutValue,
+  kMaxHeadersSize,
+  kKeepAliveMaxTimeout,
+  kKeepAliveTimeoutThreshold,
+  kHeadersTimeout,
+  kBodyTimeout,
+  kStrictContentLength,
+  kMaxRequests,
+  kCounter,
+  kMaxResponseSize,
+  kOnError,
+  kResume,
+  kHTTPContext,
+  kClosed
+} = require('../core/symbols.js')
+
+const constants = require('../llhttp/constants.js')
+const EMPTY_BUF = Buffer.alloc(0)
+const FastBuffer = Buffer[Symbol.species]
+const removeAllListeners = util.removeAllListeners
+
+let extractBody
+
+function lazyllhttp () {
+  const llhttpWasmData = process.env.JEST_WORKER_ID ? require('../llhttp/llhttp-wasm.js') : undefined
+
+  let mod
+
+  // We disable wasm SIMD on ppc64 as it seems to be broken on Power 9 architectures.
+  let useWasmSIMD = process.arch !== 'ppc64'
+  // The Env Variable UNDICI_NO_WASM_SIMD allows explicitly overriding the default behavior
+  if (process.env.UNDICI_NO_WASM_SIMD === '1') {
+    useWasmSIMD = true
+  } else if (process.env.UNDICI_NO_WASM_SIMD === '0') {
+    useWasmSIMD = false
+  }
+
+  if (useWasmSIMD) {
+    try {
+      mod = new WebAssembly.Module(require('../llhttp/llhttp_simd-wasm.js'))
+    } catch {
+    }
+  }
+
+  if (!mod) {
+    // We could check if the error was caused by the simd option not
+    // being enabled, but the occurring of this other error
+    // * https://github.com/emscripten-core/emscripten/issues/11495
+    // got me to remove that check to avoid breaking Node 12.
+    mod = new WebAssembly.Module(llhttpWasmData || require('../llhttp/llhttp-wasm.js'))
+  }
+
+  return new WebAssembly.Instance(mod, {
+    env: {
+      /**
+       * @param {number} p
+       * @param {number} at
+       * @param {number} len
+       * @returns {number}
+       */
+      wasm_on_url: (p, at, len) => {
+        return 0
+      },
+      /**
+       * @param {number} p
+       * @param {number} at
+       * @param {number} len
+       * @returns {number}
+       */
+      wasm_on_status: (p, at, len) => {
+        assert(currentParser.ptr === p)
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onStatus(new FastBuffer(currentBufferRef.buffer, start, len))
+      },
+      /**
+       * @param {number} p
+       * @returns {number}
+       */
+      wasm_on_message_begin: (p) => {
+        assert(currentParser.ptr === p)
+        return currentParser.onMessageBegin()
+      },
+      /**
+       * @param {number} p
+       * @param {number} at
+       * @param {number} len
+       * @returns {number}
+       */
+      wasm_on_header_field: (p, at, len) => {
+        assert(currentParser.ptr === p)
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onHeaderField(new FastBuffer(currentBufferRef.buffer, start, len))
+      },
+      /**
+       * @param {number} p
+       * @param {number} at
+       * @param {number} len
+       * @returns {number}
+       */
+      wasm_on_header_value: (p, at, len) => {
+        assert(currentParser.ptr === p)
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onHeaderValue(new FastBuffer(currentBufferRef.buffer, start, len))
+      },
+      /**
+       * @param {number} p
+       * @param {number} statusCode
+       * @param {0|1} upgrade
+       * @param {0|1} shouldKeepAlive
+       * @returns {number}
+       */
+      wasm_on_headers_complete: (p, statusCode, upgrade, shouldKeepAlive) => {
+        assert(currentParser.ptr === p)
+        return currentParser.onHeadersComplete(statusCode, upgrade === 1, shouldKeepAlive === 1)
+      },
+      /**
+       * @param {number} p
+       * @param {number} at
+       * @param {number} len
+       * @returns {number}
+       */
+      wasm_on_body: (p, at, len) => {
+        assert(currentParser.ptr === p)
+        const start = at - currentBufferPtr + currentBufferRef.byteOffset
+        return currentParser.onBody(new FastBuffer(currentBufferRef.buffer, start, len))
+      },
+      /**
+       * @param {number} p
+       * @returns {number}
+       */
+      wasm_on_message_complete: (p) => {
+        assert(currentParser.ptr === p)
+        return currentParser.onMessageComplete()
+      }
+
+    }
+  })
+}
+
+let llhttpInstance = null
+
+/**
+ * @type {Parser|null}
+ */
+let currentParser = null
+let currentBufferRef = null
+/**
+ * @type {number}
+ */
+let currentBufferSize = 0
+let currentBufferPtr = null
+
+const USE_NATIVE_TIMER = 0
+const USE_FAST_TIMER = 1
+
+// Use fast timers for headers and body to take eventual event loop
+// latency into account.
+const TIMEOUT_HEADERS = 2 | USE_FAST_TIMER
+const TIMEOUT_BODY = 4 | USE_FAST_TIMER
+
+// Use native timers to ignore event loop latency for keep-alive
+// handling.
+const TIMEOUT_KEEP_ALIVE = 8 | USE_NATIVE_TIMER
+
+class Parser {
+  /**
+     * @param {import('./client.js')} client
+     * @param {import('net').Socket} socket
+     * @param {*} llhttp
+     */
+  constructor (client, socket, { exports }) {
+    this.llhttp = exports
+    this.ptr = this.llhttp.llhttp_alloc(constants.TYPE.RESPONSE)
+    this.client = client
+    /**
+     * @type {import('net').Socket}
+     */
+    this.socket = socket
+    this.timeout = null
+    this.timeoutValue = null
+    this.timeoutType = null
+    this.statusCode = 0
+    this.statusText = ''
+    this.upgrade = false
+    this.headers = []
+    this.headersSize = 0
+    this.headersMaxSize = client[kMaxHeadersSize]
+    this.shouldKeepAlive = false
+    this.paused = false
+    this.resume = this.resume.bind(this)
+
+    this.bytesRead = 0
+
+    this.keepAlive = ''
+    this.contentLength = ''
+    this.connection = ''
+    this.maxResponseSize = client[kMaxResponseSize]
+  }
+
+  setTimeout (delay, type) {
+    // If the existing timer and the new timer are of different timer type
+    // (fast or native) or have different delay, we need to clear the existing
+    // timer and set a new one.
+    if (
+      delay !== this.timeoutValue ||
+      (type & USE_FAST_TIMER) ^ (this.timeoutType & USE_FAST_TIMER)
+    ) {
+      // If a timeout is already set, clear it with clearTimeout of the fast
+      // timer implementation, as it can clear fast and native timers.
+      if (this.timeout) {
+        timers.clearTimeout(this.timeout)
+        this.timeout = null
+      }
+
+      if (delay) {
+        if (type & USE_FAST_TIMER) {
+          this.timeout = timers.setFastTimeout(onParserTimeout, delay, new WeakRef(this))
+        } else {
+          this.timeout = setTimeout(onParserTimeout, delay, new WeakRef(this))
+          this.timeout?.unref()
+        }
+      }
+
+      this.timeoutValue = delay
+    } else if (this.timeout) {
+      if (this.timeout.refresh) {
+        this.timeout.refresh()
+      }
+    }
+
+    this.timeoutType = type
+  }
+
+  resume () {
+    if (this.socket.destroyed || !this.paused) {
+      return
+    }
+
+    assert(this.ptr != null)
+    assert(currentParser === null)
+
+    this.llhttp.llhttp_resume(this.ptr)
+
+    assert(this.timeoutType === TIMEOUT_BODY)
+    if (this.timeout) {
+      if (this.timeout.refresh) {
+        this.timeout.refresh()
+      }
+    }
+
+    this.paused = false
+    this.execute(this.socket.read() || EMPTY_BUF) // Flush parser.
+    this.readMore()
+  }
+
+  readMore () {
+    while (!this.paused && this.ptr) {
+      const chunk = this.socket.read()
+      if (chunk === null) {
+        break
+      }
+      this.execute(chunk)
+    }
+  }
+
+  /**
+   * @param {Buffer} chunk
+   */
+  execute (chunk) {
+    assert(currentParser === null)
+    assert(this.ptr != null)
+    assert(!this.paused)
+
+    const { socket, llhttp } = this
+
+    // Allocate a new buffer if the current buffer is too small.
+    if (chunk.length > currentBufferSize) {
+      if (currentBufferPtr) {
+        llhttp.free(currentBufferPtr)
+      }
+      // Allocate a buffer that is a multiple of 4096 bytes.
+      currentBufferSize = Math.ceil(chunk.length / 4096) * 4096
+      currentBufferPtr = llhttp.malloc(currentBufferSize)
+    }
+
+    new Uint8Array(llhttp.memory.buffer, currentBufferPtr, currentBufferSize).set(chunk)
+
+    // Call `execute` on the wasm parser.
+    // We pass the `llhttp_parser` pointer address, the pointer address of buffer view data,
+    // and finally the length of bytes to parse.
+    // The return value is an error code or `constants.ERROR.OK`.
+    try {
+      let ret
+
+      try {
+        currentBufferRef = chunk
+        currentParser = this
+        ret = llhttp.llhttp_execute(this.ptr, currentBufferPtr, chunk.length)
+      } finally {
+        currentParser = null
+        currentBufferRef = null
+      }
+
+      if (ret !== constants.ERROR.OK) {
+        const data = chunk.subarray(llhttp.llhttp_get_error_pos(this.ptr) - currentBufferPtr)
+
+        if (ret === constants.ERROR.PAUSED_UPGRADE) {
+          this.onUpgrade(data)
+        } else if (ret === constants.ERROR.PAUSED) {
+          this.paused = true
+          socket.unshift(data)
+        } else {
+          const ptr = llhttp.llhttp_get_error_reason(this.ptr)
+          let message = ''
+          if (ptr) {
+            const len = new Uint8Array(llhttp.memory.buffer, ptr).indexOf(0)
+            message =
+              'Response does not match the HTTP/1.1 protocol (' +
+              Buffer.from(llhttp.memory.buffer, ptr, len).toString() +
+              ')'
+          }
+          throw new HTTPParserError(message, constants.ERROR[ret], data)
+        }
+      }
+    } catch (err) {
+      util.destroy(socket, err)
+    }
+  }
+
+  destroy () {
+    assert(currentParser === null)
+    assert(this.ptr != null)
+
+    this.llhttp.llhttp_free(this.ptr)
+    this.ptr = null
+
+    this.timeout && timers.clearTimeout(this.timeout)
+    this.timeout = null
+    this.timeoutValue = null
+    this.timeoutType = null
+
+    this.paused = false
+  }
+
+  /**
+   * @param {Buffer} buf
+   * @returns {0}
+   */
+  onStatus (buf) {
+    this.statusText = buf.toString()
+    return 0
+  }
+
+  /**
+   * @returns {0|-1}
+   */
+  onMessageBegin () {
+    const { socket, client } = this
+
+    if (socket.destroyed) {
+      return -1
+    }
+
+    const request = client[kQueue][client[kRunningIdx]]
+    if (!request) {
+      return -1
+    }
+    request.onResponseStarted()
+
+    return 0
+  }
+
+  /**
+   * @param {Buffer} buf
+   * @returns {number}
+   */
+  onHeaderField (buf) {
+    const len = this.headers.length
+
+    if ((len & 1) === 0) {
+      this.headers.push(buf)
+    } else {
+      this.headers[len - 1] = Buffer.concat([this.headers[len - 1], buf])
+    }
+
+    this.trackHeader(buf.length)
+
+    return 0
+  }
+
+  /**
+   * @param {Buffer} buf
+   * @returns {number}
+   */
+  onHeaderValue (buf) {
+    let len = this.headers.length
+
+    if ((len & 1) === 1) {
+      this.headers.push(buf)
+      len += 1
+    } else {
+      this.headers[len - 1] = Buffer.concat([this.headers[len - 1], buf])
+    }
+
+    const key = this.headers[len - 2]
+    if (key.length === 10) {
+      const headerName = util.bufferToLowerCasedHeaderName(key)
+      if (headerName === 'keep-alive') {
+        this.keepAlive += buf.toString()
+      } else if (headerName === 'connection') {
+        this.connection += buf.toString()
+      }
+    } else if (key.length === 14 && util.bufferToLowerCasedHeaderName(key) === 'content-length') {
+      this.contentLength += buf.toString()
+    }
+
+    this.trackHeader(buf.length)
+
+    return 0
+  }
+
+  /**
+   * @param {number} len
+   */
+  trackHeader (len) {
+    this.headersSize += len
+    if (this.headersSize >= this.headersMaxSize) {
+      util.destroy(this.socket, new HeadersOverflowError())
+    }
+  }
+
+  /**
+   * @param {Buffer} head
+   */
+  onUpgrade (head) {
+    const { upgrade, client, socket, headers, statusCode } = this
+
+    assert(upgrade)
+    assert(client[kSocket] === socket)
+    assert(!socket.destroyed)
+    assert(!this.paused)
+    assert((headers.length & 1) === 0)
+
+    const request = client[kQueue][client[kRunningIdx]]
+    assert(request)
+    assert(request.upgrade || request.method === 'CONNECT')
+
+    this.statusCode = 0
+    this.statusText = ''
+    this.shouldKeepAlive = false
+
+    this.headers = []
+    this.headersSize = 0
+
+    socket.unshift(head)
+
+    socket[kParser].destroy()
+    socket[kParser] = null
+
+    socket[kClient] = null
+    socket[kError] = null
+
+    removeAllListeners(socket)
+
+    client[kSocket] = null
+    client[kHTTPContext] = null // TODO (fix): This is hacky...
+    client[kQueue][client[kRunningIdx]++] = null
+    client.emit('disconnect', client[kUrl], [client], new InformationalError('upgrade'))
+
+    try {
+      request.onUpgrade(statusCode, headers, socket)
+    } catch (err) {
+      util.destroy(socket, err)
+    }
+
+    client[kResume]()
+  }
+
+  /**
+   * @param {number} statusCode
+   * @param {boolean} upgrade
+   * @param {boolean} shouldKeepAlive
+   * @returns {number}
+   */
+  onHeadersComplete (statusCode, upgrade, shouldKeepAlive) {
+    const { client, socket, headers, statusText } = this
+
+    if (socket.destroyed) {
+      return -1
+    }
+
+    const request = client[kQueue][client[kRunningIdx]]
+
+    if (!request) {
+      return -1
+    }
+
+    assert(!this.upgrade)
+    assert(this.statusCode < 200)
+
+    if (statusCode === 100) {
+      util.destroy(socket, new SocketError('bad response', util.getSocketInfo(socket)))
+      return -1
+    }
+
+    /* this can only happen if server is misbehaving */
+    if (upgrade && !request.upgrade) {
+      util.destroy(socket, new SocketError('bad upgrade', util.getSocketInfo(socket)))
+      return -1
+    }
+
+    assert(this.timeoutType === TIMEOUT_HEADERS)
+
+    this.statusCode = statusCode
+    this.shouldKeepAlive = (
+      shouldKeepAlive ||
+      // Override llhttp value which does not allow keepAlive for HEAD.
+      (request.method === 'HEAD' && !socket[kReset] && this.connection.toLowerCase() === 'keep-alive')
+    )
+
+    if (this.statusCode >= 200) {
+      const bodyTimeout = request.bodyTimeout != null
+        ? request.bodyTimeout
+        : client[kBodyTimeout]
+      this.setTimeout(bodyTimeout, TIMEOUT_BODY)
+    } else if (this.timeout) {
+      if (this.timeout.refresh) {
+        this.timeout.refresh()
+      }
+    }
+
+    if (request.method === 'CONNECT') {
+      assert(client[kRunning] === 1)
+      this.upgrade = true
+      return 2
+    }
+
+    if (upgrade) {
+      assert(client[kRunning] === 1)
+      this.upgrade = true
+      return 2
+    }
+
+    assert((this.headers.length & 1) === 0)
+    this.headers = []
+    this.headersSize = 0
+
+    if (this.shouldKeepAlive && client[kPipelining]) {
+      const keepAliveTimeout = this.keepAlive ? util.parseKeepAliveTimeout(this.keepAlive) : null
+
+      if (keepAliveTimeout != null) {
+        const timeout = Math.min(
+          keepAliveTimeout - client[kKeepAliveTimeoutThreshold],
+          client[kKeepAliveMaxTimeout]
+        )
+        if (timeout <= 0) {
+          socket[kReset] = true
+        } else {
+          client[kKeepAliveTimeoutValue] = timeout
+        }
+      } else {
+        client[kKeepAliveTimeoutValue] = client[kKeepAliveDefaultTimeout]
+      }
+    } else {
+      // Stop more requests from being dispatched.
+      socket[kReset] = true
+    }
+
+    const pause = request.onHeaders(statusCode, headers, this.resume, statusText) === false
+
+    if (request.aborted) {
+      return -1
+    }
+
+    if (request.method === 'HEAD') {
+      return 1
+    }
+
+    if (statusCode < 200) {
+      return 1
+    }
+
+    if (socket[kBlocking]) {
+      socket[kBlocking] = false
+      client[kResume]()
+    }
+
+    return pause ? constants.ERROR.PAUSED : 0
+  }
+
+  /**
+   * @param {Buffer} buf
+   * @returns {number}
+   */
+  onBody (buf) {
+    const { client, socket, statusCode, maxResponseSize } = this
+
+    if (socket.destroyed) {
+      return -1
+    }
+
+    const request = client[kQueue][client[kRunningIdx]]
+    assert(request)
+
+    assert(this.timeoutType === TIMEOUT_BODY)
+    if (this.timeout) {
+      if (this.timeout.refresh) {
+        this.timeout.refresh()
+      }
+    }
+
+    assert(statusCode >= 200)
+
+    if (maxResponseSize > -1 && this.bytesRead + buf.length > maxResponseSize) {
+      util.destroy(socket, new ResponseExceededMaxSizeError())
+      return -1
+    }
+
+    this.bytesRead += buf.length
+
+    if (request.onData(buf) === false) {
+      return constants.ERROR.PAUSED
+    }
+
+    return 0
+  }
+
+  /**
+   * @returns {number}
+   */
+  onMessageComplete () {
+    const { client, socket, statusCode, upgrade, headers, contentLength, bytesRead, shouldKeepAlive } = this
+
+    if (socket.destroyed && (!statusCode || shouldKeepAlive)) {
+      return -1
+    }
+
+    if (upgrade) {
+      return 0
+    }
+
+    assert(statusCode >= 100)
+    assert((this.headers.length & 1) === 0)
+
+    const request = client[kQueue][client[kRunningIdx]]
+    assert(request)
+
+    this.statusCode = 0
+    this.statusText = ''
+    this.bytesRead = 0
+    this.contentLength = ''
+    this.keepAlive = ''
+    this.connection = ''
+
+    this.headers = []
+    this.headersSize = 0
+
+    if (statusCode < 200) {
+      return 0
+    }
+
+    if (request.method !== 'HEAD' && contentLength && bytesRead !== parseInt(contentLength, 10)) {
+      util.destroy(socket, new ResponseContentLengthMismatchError())
+      return -1
+    }
+
+    request.onComplete(headers)
+
+    client[kQueue][client[kRunningIdx]++] = null
+
+    if (socket[kWriting]) {
+      assert(client[kRunning] === 0)
+      // Response completed before request.
+      util.destroy(socket, new InformationalError('reset'))
+      return constants.ERROR.PAUSED
+    } else if (!shouldKeepAlive) {
+      util.destroy(socket, new InformationalError('reset'))
+      return constants.ERROR.PAUSED
+    } else if (socket[kReset] && client[kRunning] === 0) {
+      // Destroy socket once all requests have completed.
+      // The request at the tail of the pipeline is the one
+      // that requested reset and no further requests should
+      // have been queued since then.
+      util.destroy(socket, new InformationalError('reset'))
+      return constants.ERROR.PAUSED
+    } else if (client[kPipelining] == null || client[kPipelining] === 1) {
+      // We must wait a full event loop cycle to reuse this socket to make sure
+      // that non-spec compliant servers are not closing the connection even if they
+      // said they won't.
+      setImmediate(client[kResume])
+    } else {
+      client[kResume]()
+    }
+
+    return 0
+  }
+}
+
+function onParserTimeout (parserWeakRef) {
+  const parser = parserWeakRef.deref()
+  if (!parser) {
+    return
+  }
+
+  const { socket, timeoutType, client, paused } = parser
+
+  if (timeoutType === TIMEOUT_HEADERS) {
+    if (!socket[kWriting] || socket.writableNeedDrain || client[kRunning] > 1) {
+      assert(!paused, 'cannot be paused while waiting for headers')
+      util.destroy(socket, new HeadersTimeoutError())
+    }
+  } else if (timeoutType === TIMEOUT_BODY) {
+    if (!paused) {
+      util.destroy(socket, new BodyTimeoutError())
+    }
+  } else if (timeoutType === TIMEOUT_KEEP_ALIVE) {
+    assert(client[kRunning] === 0 && client[kKeepAliveTimeoutValue])
+    util.destroy(socket, new InformationalError('socket idle timeout'))
+  }
+}
+
+/**
+ * @param {import ('./client.js')} client
+ * @param {import('net').Socket} socket
+ * @returns
+ */
+function connectH1 (client, socket) {
+  client[kSocket] = socket
+
+  if (!llhttpInstance) {
+    llhttpInstance = lazyllhttp()
+  }
+
+  if (socket.errored) {
+    throw socket.errored
+  }
+
+  if (socket.destroyed) {
+    throw new SocketError('destroyed')
+  }
+
+  socket[kNoRef] = false
+  socket[kWriting] = false
+  socket[kReset] = false
+  socket[kBlocking] = false
+  socket[kParser] = new Parser(client, socket, llhttpInstance)
+
+  util.addListener(socket, 'error', onHttpSocketError)
+  util.addListener(socket, 'readable', onHttpSocketReadable)
+  util.addListener(socket, 'end', onHttpSocketEnd)
+  util.addListener(socket, 'close', onHttpSocketClose)
+
+  socket[kClosed] = false
+  socket.on('close', onSocketClose)
+
+  return {
+    version: 'h1',
+    defaultPipelining: 1,
+    write (request) {
+      return writeH1(client, request)
+    },
+    resume () {
+      resumeH1(client)
+    },
+    /**
+     * @param {Error|undefined} err
+     * @param {() => void} callback
+     */
+    destroy (err, callback) {
+      if (socket[kClosed]) {
+        queueMicrotask(callback)
+      } else {
+        socket.on('close', callback)
+        socket.destroy(err)
+      }
+    },
+    /**
+     * @returns {boolean}
+     */
+    get destroyed () {
+      return socket.destroyed
+    },
+    /**
+     * @param {import('../core/request.js')} request
+     * @returns {boolean}
+     */
+    busy (request) {
+      if (socket[kWriting] || socket[kReset] || socket[kBlocking]) {
+        return true
+      }
+
+      if (request) {
+        if (client[kRunning] > 0 && !request.idempotent) {
+          // Non-idempotent request cannot be retried.
+          // Ensure that no other requests are inflight and
+          // could cause failure.
+          return true
+        }
+
+        if (client[kRunning] > 0 && (request.upgrade || request.method === 'CONNECT')) {
+          // Don't dispatch an upgrade until all preceding requests have completed.
+          // A misbehaving server might upgrade the connection before all pipelined
+          // request has completed.
+          return true
+        }
+
+        if (client[kRunning] > 0 && util.bodyLength(request.body) !== 0 &&
+          (util.isStream(request.body) || util.isAsyncIterable(request.body) || util.isFormDataLike(request.body))) {
+          // Request with stream or iterator body can error while other requests
+          // are inflight and indirectly error those as well.
+          // Ensure this doesn't happen by waiting for inflight
+          // to complete before dispatching.
+
+          // Request with stream or iterator body cannot be retried.
+          // Ensure that no other requests are inflight and
+          // could cause failure.
+          return true
+        }
+      }
+
+      return false
+    }
+  }
+}
+
+function onHttpSocketError (err) {
+  assert(err.code !== 'ERR_TLS_CERT_ALTNAME_INVALID')
+
+  const parser = this[kParser]
+
+  // On Mac OS, we get an ECONNRESET even if there is a full body to be forwarded
+  // to the user.
+  if (err.code === 'ECONNRESET' && parser.statusCode && !parser.shouldKeepAlive) {
+    // We treat all incoming data so for as a valid response.
+    parser.onMessageComplete()
+    return
+  }
+
+  this[kError] = err
+
+  this[kClient][kOnError](err)
+}
+
+function onHttpSocketReadable () {
+  this[kParser]?.readMore()
+}
+
+function onHttpSocketEnd () {
+  const parser = this[kParser]
+
+  if (parser.statusCode && !parser.shouldKeepAlive) {
+    // We treat all incoming data so far as a valid response.
+    parser.onMessageComplete()
+    return
+  }
+
+  util.destroy(this, new SocketError('other side closed', util.getSocketInfo(this)))
+}
+
+function onHttpSocketClose () {
+  const parser = this[kParser]
+
+  if (parser) {
+    if (!this[kError] && parser.statusCode && !parser.shouldKeepAlive) {
+      // We treat all incoming data so far as a valid response.
+      parser.onMessageComplete()
+    }
+
+    this[kParser].destroy()
+    this[kParser] = null
+  }
+
+  const err = this[kError] || new SocketError('closed', util.getSocketInfo(this))
+
+  const client = this[kClient]
+
+  client[kSocket] = null
+  client[kHTTPContext] = null // TODO (fix): This is hacky...
+
+  if (client.destroyed) {
+    assert(client[kPending] === 0)
+
+    // Fail entire queue.
+    const requests = client[kQueue].splice(client[kRunningIdx])
+    for (let i = 0; i < requests.length; i++) {
+      const request = requests[i]
+      util.errorRequest(client, request, err)
+    }
+  } else if (client[kRunning] > 0 && err.code !== 'UND_ERR_INFO') {
+    // Fail head of pipeline.
+    const request = client[kQueue][client[kRunningIdx]]
+    client[kQueue][client[kRunningIdx]++] = null
+
+    util.errorRequest(client, request, err)
+  }
+
+  client[kPendingIdx] = client[kRunningIdx]
+
+  assert(client[kRunning] === 0)
+
+  client.emit('disconnect', client[kUrl], [client], err)
+
+  client[kResume]()
+}
+
+function onSocketClose () {
+  this[kClosed] = true
+}
+
+/**
+ * @param {import('./client.js')} client
+ */
+function resumeH1 (client) {
+  const socket = client[kSocket]
+
+  if (socket && !socket.destroyed) {
+    if (client[kSize] === 0) {
+      if (!socket[kNoRef] && socket.unref) {
+        socket.unref()
+        socket[kNoRef] = true
+      }
+    } else if (socket[kNoRef] && socket.ref) {
+      socket.ref()
+      socket[kNoRef] = false
+    }
+
+    if (client[kSize] === 0) {
+      if (socket[kParser].timeoutType !== TIMEOUT_KEEP_ALIVE) {
+        socket[kParser].setTimeout(client[kKeepAliveTimeoutValue], TIMEOUT_KEEP_ALIVE)
+      }
+    } else if (client[kRunning] > 0 && socket[kParser].statusCode < 200) {
+      if (socket[kParser].timeoutType !== TIMEOUT_HEADERS) {
+        const request = client[kQueue][client[kRunningIdx]]
+        const headersTimeout = request.headersTimeout != null
+          ? request.headersTimeout
+          : client[kHeadersTimeout]
+        socket[kParser].setTimeout(headersTimeout, TIMEOUT_HEADERS)
+      }
+    }
+  }
+}
+
+// https://www.rfc-editor.org/rfc/rfc7230#section-3.3.2
+function shouldSendContentLength (method) {
+  return method !== 'GET' && method !== 'HEAD' && method !== 'OPTIONS' && method !== 'TRACE' && method !== 'CONNECT'
+}
+
+/**
+ * @param {import('./client.js')} client
+ * @param {import('../core/request.js')} request
+ * @returns
+ */
+function writeH1 (client, request) {
+  const { method, path, host, upgrade, blocking, reset } = request
+
+  let { body, headers, contentLength } = request
+
+  // https://tools.ietf.org/html/rfc7231#section-4.3.1
+  // https://tools.ietf.org/html/rfc7231#section-4.3.2
+  // https://tools.ietf.org/html/rfc7231#section-4.3.5
+
+  // Sending a payload body on a request that does not
+  // expect it can cause undefined behavior on some
+  // servers and corrupt connection state. Do not
+  // re-use the connection for further requests.
+
+  const expectsPayload = (
+    method === 'PUT' ||
+    method === 'POST' ||
+    method === 'PATCH' ||
+    method === 'QUERY' ||
+    method === 'PROPFIND' ||
+    method === 'PROPPATCH'
+  )
+
+  if (util.isFormDataLike(body)) {
+    if (!extractBody) {
+      extractBody = require('../web/fetch/body.js').extractBody
+    }
+
+    const [bodyStream, contentType] = extractBody(body)
+    if (request.contentType == null) {
+      headers.push('content-type', contentType)
+    }
+    body = bodyStream.stream
+    contentLength = bodyStream.length
+  } else if (util.isBlobLike(body) && request.contentType == null && body.type) {
+    headers.push('content-type', body.type)
+  }
+
+  if (body && typeof body.read === 'function') {
+    // Try to read EOF in order to get length.
+    body.read(0)
+  }
+
+  const bodyLength = util.bodyLength(body)
+
+  contentLength = bodyLength ?? contentLength
+
+  if (contentLength === null) {
+    contentLength = request.contentLength
+  }
+
+  if (contentLength === 0 && !expectsPayload) {
+    // https://tools.ietf.org/html/rfc7230#section-3.3.2
+    // A user agent SHOULD NOT send a Content-Length header field when
+    // the request message does not contain a payload body and the method
+    // semantics do not anticipate such a body.
+
+    contentLength = null
+  }
+
+  // https://github.com/nodejs/undici/issues/2046
+  // A user agent may send a Content-Length header with 0 value, this should be allowed.
+  if (shouldSendContentLength(method) && contentLength > 0 && request.contentLength !== null && request.contentLength !== contentLength) {
+    if (client[kStrictContentLength]) {
+      util.errorRequest(client, request, new RequestContentLengthMismatchError())
+      return false
+    }
+
+    process.emitWarning(new RequestContentLengthMismatchError())
+  }
+
+  const socket = client[kSocket]
+
+  /**
+   * @param {Error} [err]
+   * @returns {void}
+   */
+  const abort = (err) => {
+    if (request.aborted || request.completed) {
+      return
+    }
+
+    util.errorRequest(client, request, err || new RequestAbortedError())
+
+    util.destroy(body)
+    util.destroy(socket, new InformationalError('aborted'))
+  }
+
+  try {
+    request.onConnect(abort)
+  } catch (err) {
+    util.errorRequest(client, request, err)
+  }
+
+  if (request.aborted) {
+    return false
+  }
+
+  if (method === 'HEAD') {
+    // https://github.com/mcollina/undici/issues/258
+    // Close after a HEAD request to interop with misbehaving servers
+    // that may send a body in the response.
+
+    socket[kReset] = true
+  }
+
+  if (upgrade || method === 'CONNECT') {
+    // On CONNECT or upgrade, block pipeline from dispatching further
+    // requests on this connection.
+
+    socket[kReset] = true
+  }
+
+  if (reset != null) {
+    socket[kReset] = reset
+  }
+
+  if (client[kMaxRequests] && socket[kCounter]++ >= client[kMaxRequests]) {
+    socket[kReset] = true
+  }
+
+  if (blocking) {
+    socket[kBlocking] = true
+  }
+
+  let header = `${method} ${path} HTTP/1.1\r\n`
+
+  if (typeof host === 'string') {
+    header += `host: ${host}\r\n`
+  } else {
+    header += client[kHostHeader]
+  }
+
+  if (upgrade) {
+    header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
+  } else if (client[kPipelining] && !socket[kReset]) {
+    header += 'connection: keep-alive\r\n'
+  } else {
+    header += 'connection: close\r\n'
+  }
+
+  if (Array.isArray(headers)) {
+    for (let n = 0; n < headers.length; n += 2) {
+      const key = headers[n + 0]
+      const val = headers[n + 1]
+
+      if (Array.isArray(val)) {
+        for (let i = 0; i < val.length; i++) {
+          header += `${key}: ${val[i]}\r\n`
+        }
+      } else {
+        header += `${key}: ${val}\r\n`
+      }
+    }
+  }
+
+  if (channels.sendHeaders.hasSubscribers) {
+    channels.sendHeaders.publish({ request, headers: header, socket })
+  }
+
+  if (!body || bodyLength === 0) {
+    writeBuffer(abort, null, client, request, socket, contentLength, header, expectsPayload)
+  } else if (util.isBuffer(body)) {
+    writeBuffer(abort, body, client, request, socket, contentLength, header, expectsPayload)
+  } else if (util.isBlobLike(body)) {
+    if (typeof body.stream === 'function') {
+      writeIterable(abort, body.stream(), client, request, socket, contentLength, header, expectsPayload)
+    } else {
+      writeBlob(abort, body, client, request, socket, contentLength, header, expectsPayload)
+    }
+  } else if (util.isStream(body)) {
+    writeStream(abort, body, client, request, socket, contentLength, header, expectsPayload)
+  } else if (util.isIterable(body)) {
+    writeIterable(abort, body, client, request, socket, contentLength, header, expectsPayload)
+  } else {
+    assert(false)
+  }
+
+  return true
+}
+
+/**
+ * @param {AbortCallback} abort
+ * @param {import('stream').Stream} body
+ * @param {import('./client.js')} client
+ * @param {import('../core/request.js')} request
+ * @param {import('net').Socket} socket
+ * @param {number} contentLength
+ * @param {string} header
+ * @param {boolean} expectsPayload
+ */
+function writeStream (abort, body, client, request, socket, contentLength, header, expectsPayload) {
+  assert(contentLength !== 0 || client[kRunning] === 0, 'stream body cannot be pipelined')
+
+  let finished = false
+
+  const writer = new AsyncWriter({ abort, socket, request, contentLength, client, expectsPayload, header })
+
+  /**
+   * @param {Buffer} chunk
+   * @returns {void}
+   */
+  const onData = function (chunk) {
+    if (finished) {
+      return
+    }
+
+    try {
+      if (!writer.write(chunk) && this.pause) {
+        this.pause()
+      }
+    } catch (err) {
+      util.destroy(this, err)
+    }
+  }
+
+  /**
+   * @returns {void}
+   */
+  const onDrain = function () {
+    if (finished) {
+      return
+    }
+
+    if (body.resume) {
+      body.resume()
+    }
+  }
+
+  /**
+   * @returns {void}
+   */
+  const onClose = function () {
+    // 'close' might be emitted *before* 'error' for
+    // broken streams. Wait a tick to avoid this case.
+    queueMicrotask(() => {
+      // It's only safe to remove 'error' listener after
+      // 'close'.
+      body.removeListener('error', onFinished)
+    })
+
+    if (!finished) {
+      const err = new RequestAbortedError()
+      queueMicrotask(() => onFinished(err))
+    }
+  }
+
+  /**
+   * @param {Error} [err]
+   * @returns
+   */
+  const onFinished = function (err) {
+    if (finished) {
+      return
+    }
+
+    finished = true
+
+    assert(socket.destroyed || (socket[kWriting] && client[kRunning] <= 1))
+
+    socket
+      .off('drain', onDrain)
+      .off('error', onFinished)
+
+    body
+      .removeListener('data', onData)
+      .removeListener('end', onFinished)
+      .removeListener('close', onClose)
+
+    if (!err) {
+      try {
+        writer.end()
+      } catch (er) {
+        err = er
+      }
+    }
+
+    writer.destroy(err)
+
+    if (err && (err.code !== 'UND_ERR_INFO' || err.message !== 'reset')) {
+      util.destroy(body, err)
+    } else {
+      util.destroy(body)
+    }
+  }
+
+  body
+    .on('data', onData)
+    .on('end', onFinished)
+    .on('error', onFinished)
+    .on('close', onClose)
+
+  if (body.resume) {
+    body.resume()
+  }
+
+  socket
+    .on('drain', onDrain)
+    .on('error', onFinished)
+
+  if (body.errorEmitted ?? body.errored) {
+    setImmediate(onFinished, body.errored)
+  } else if (body.endEmitted ?? body.readableEnded) {
+    setImmediate(onFinished, null)
+  }
+
+  if (body.closeEmitted ?? body.closed) {
+    setImmediate(onClose)
+  }
+}
+
+/**
+ * @typedef AbortCallback
+ * @type {Function}
+ * @param {Error} [err]
+ * @returns {void}
+ */
+
+/**
+ * @param {AbortCallback} abort
+ * @param {Uint8Array|null} body
+ * @param {import('./client.js')} client
+ * @param {import('../core/request.js')} request
+ * @param {import('net').Socket} socket
+ * @param {number} contentLength
+ * @param {string} header
+ * @param {boolean} expectsPayload
+ * @returns {void}
+ */
+function writeBuffer (abort, body, client, request, socket, contentLength, header, expectsPayload) {
+  try {
+    if (!body) {
+      if (contentLength === 0) {
+        socket.write(`${header}content-length: 0\r\n\r\n`, 'latin1')
+      } else {
+        assert(contentLength === null, 'no body must not have content length')
+        socket.write(`${header}\r\n`, 'latin1')
+      }
+    } else if (util.isBuffer(body)) {
+      assert(contentLength === body.byteLength, 'buffer body must have content length')
+
+      socket.cork()
+      socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
+      socket.write(body)
+      socket.uncork()
+      request.onBodySent(body)
+
+      if (!expectsPayload && request.reset !== false) {
+        socket[kReset] = true
+      }
+    }
+    request.onRequestSent()
+
+    client[kResume]()
+  } catch (err) {
+    abort(err)
+  }
+}
+
+/**
+ * @param {AbortCallback} abort
+ * @param {Blob} body
+ * @param {import('./client.js')} client
+ * @param {import('../core/request.js')} request
+ * @param {import('net').Socket} socket
+ * @param {number} contentLength
+ * @param {string} header
+ * @param {boolean} expectsPayload
+ * @returns {Promise<void>}
+ */
+async function writeBlob (abort, body, client, request, socket, contentLength, header, expectsPayload) {
+  assert(contentLength === body.size, 'blob body must have content length')
+
+  try {
+    if (contentLength != null && contentLength !== body.size) {
+      throw new RequestContentLengthMismatchError()
+    }
+
+    const buffer = Buffer.from(await body.arrayBuffer())
+
+    socket.cork()
+    socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
+    socket.write(buffer)
+    socket.uncork()
+
+    request.onBodySent(buffer)
+    request.onRequestSent()
+
+    if (!expectsPayload && request.reset !== false) {
+      socket[kReset] = true
+    }
+
+    client[kResume]()
+  } catch (err) {
+    abort(err)
+  }
+}
+
+/**
+ * @param {AbortCallback} abort
+ * @param {Iterable} body
+ * @param {import('./client.js')} client
+ * @param {import('../core/request.js')} request
+ * @param {import('net').Socket} socket
+ * @param {number} contentLength
+ * @param {string} header
+ * @param {boolean} expectsPayload
+ * @returns {Promise<void>}
+ */
+async function writeIterable (abort, body, client, request, socket, contentLength, header, expectsPayload) {
+  assert(contentLength !== 0 || client[kRunning] === 0, 'iterator body cannot be pipelined')
+
+  let callback = null
+  function onDrain () {
+    if (callback) {
+      const cb = callback
+      callback = null
+      cb()
+    }
+  }
+
+  const waitForDrain = () => new Promise((resolve, reject) => {
+    assert(callback === null)
+
+    if (socket[kError]) {
+      reject(socket[kError])
+    } else {
+      callback = resolve
+    }
+  })
+
+  socket
+    .on('close', onDrain)
+    .on('drain', onDrain)
+
+  const writer = new AsyncWriter({ abort, socket, request, contentLength, client, expectsPayload, header })
+  try {
+    // It's up to the user to somehow abort the async iterable.
+    for await (const chunk of body) {
+      if (socket[kError]) {
+        throw socket[kError]
+      }
+
+      if (!writer.write(chunk)) {
+        await waitForDrain()
+      }
+    }
+
+    writer.end()
+  } catch (err) {
+    writer.destroy(err)
+  } finally {
+    socket
+      .off('close', onDrain)
+      .off('drain', onDrain)
+  }
+}
+
+class AsyncWriter {
+  /**
+   *
+   * @param {object} arg
+   * @param {AbortCallback} arg.abort
+   * @param {import('net').Socket} arg.socket
+   * @param {import('../core/request.js')} arg.request
+   * @param {number} arg.contentLength
+   * @param {import('./client.js')} arg.client
+   * @param {boolean} arg.expectsPayload
+   * @param {string} arg.header
+   */
+  constructor ({ abort, socket, request, contentLength, client, expectsPayload, header }) {
+    this.socket = socket
+    this.request = request
+    this.contentLength = contentLength
+    this.client = client
+    this.bytesWritten = 0
+    this.expectsPayload = expectsPayload
+    this.header = header
+    this.abort = abort
+
+    socket[kWriting] = true
+  }
+
+  /**
+   * @param {Buffer} chunk
+   * @returns
+   */
+  write (chunk) {
+    const { socket, request, contentLength, client, bytesWritten, expectsPayload, header } = this
+
+    if (socket[kError]) {
+      throw socket[kError]
+    }
+
+    if (socket.destroyed) {
+      return false
+    }
+
+    const len = Buffer.byteLength(chunk)
+    if (!len) {
+      return true
+    }
+
+    // We should defer writing chunks.
+    if (contentLength !== null && bytesWritten + len > contentLength) {
+      if (client[kStrictContentLength]) {
+        throw new RequestContentLengthMismatchError()
+      }
+
+      process.emitWarning(new RequestContentLengthMismatchError())
+    }
+
+    socket.cork()
+
+    if (bytesWritten === 0) {
+      if (!expectsPayload && request.reset !== false) {
+        socket[kReset] = true
+      }
+
+      if (contentLength === null) {
+        socket.write(`${header}transfer-encoding: chunked\r\n`, 'latin1')
+      } else {
+        socket.write(`${header}content-length: ${contentLength}\r\n\r\n`, 'latin1')
+      }
+    }
+
+    if (contentLength === null) {
+      socket.write(`\r\n${len.toString(16)}\r\n`, 'latin1')
+    }
+
+    this.bytesWritten += len
+
+    const ret = socket.write(chunk)
+
+    socket.uncork()
+
+    request.onBodySent(chunk)
+
+    if (!ret) {
+      if (socket[kParser].timeout && socket[kParser].timeoutType === TIMEOUT_HEADERS) {
+        if (socket[kParser].timeout.refresh) {
+          socket[kParser].timeout.refresh()
+        }
+      }
+    }
+
+    return ret
+  }
+
+  /**
+   * @returns {void}
+   */
+  end () {
+    const { socket, contentLength, client, bytesWritten, expectsPayload, header, request } = this
+    request.onRequestSent()
+
+    socket[kWriting] = false
+
+    if (socket[kError]) {
+      throw socket[kError]
+    }
+
+    if (socket.destroyed) {
+      return
+    }
+
+    if (bytesWritten === 0) {
+      if (expectsPayload) {
+        // https://tools.ietf.org/html/rfc7230#section-3.3.2
+        // A user agent SHOULD send a Content-Length in a request message when
+        // no Transfer-Encoding is sent and the request method defines a meaning
+        // for an enclosed payload body.
+
+        socket.write(`${header}content-length: 0\r\n\r\n`, 'latin1')
+      } else {
+        socket.write(`${header}\r\n`, 'latin1')
+      }
+    } else if (contentLength === null) {
+      socket.write('\r\n0\r\n\r\n', 'latin1')
+    }
+
+    if (contentLength !== null && bytesWritten !== contentLength) {
+      if (client[kStrictContentLength]) {
+        throw new RequestContentLengthMismatchError()
+      } else {
+        process.emitWarning(new RequestContentLengthMismatchError())
+      }
+    }
+
+    if (socket[kParser].timeout && socket[kParser].timeoutType === TIMEOUT_HEADERS) {
+      if (socket[kParser].timeout.refresh) {
+        socket[kParser].timeout.refresh()
+      }
+    }
+
+    client[kResume]()
+  }
+
+  /**
+   * @param {Error} [err]
+   * @returns {void}
+   */
+  destroy (err) {
+    const { socket, client, abort } = this
+
+    socket[kWriting] = false
+
+    if (err) {
+      assert(client[kRunning] <= 1, 'pipeline should only contain this request')
+      abort(err)
+    }
+  }
+}
+
+module.exports = connectH1
diff --git a/vanilla/node_modules/undici/lib/dispatcher/client-h2.js b/vanilla/node_modules/undici/lib/dispatcher/client-h2.js
new file mode 100644
index 0000000..0969108
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/client-h2.js
@@ -0,0 +1,990 @@
+'use strict'
+
+const assert = require('node:assert')
+const { pipeline } = require('node:stream')
+const util = require('../core/util.js')
+const {
+  RequestContentLengthMismatchError,
+  RequestAbortedError,
+  SocketError,
+  InformationalError,
+  InvalidArgumentError
+} = require('../core/errors.js')
+const {
+  kUrl,
+  kReset,
+  kClient,
+  kRunning,
+  kPending,
+  kQueue,
+  kPendingIdx,
+  kRunningIdx,
+  kError,
+  kSocket,
+  kStrictContentLength,
+  kOnError,
+  kMaxConcurrentStreams,
+  kPingInterval,
+  kHTTP2Session,
+  kHTTP2InitialWindowSize,
+  kHTTP2ConnectionWindowSize,
+  kResume,
+  kSize,
+  kHTTPContext,
+  kClosed,
+  kBodyTimeout,
+  kEnableConnectProtocol,
+  kRemoteSettings,
+  kHTTP2Stream,
+  kHTTP2SessionState
+} = require('../core/symbols.js')
+const { channels } = require('../core/diagnostics.js')
+
+const kOpenStreams = Symbol('open streams')
+
+let extractBody
+
+/** @type {import('http2')} */
+let http2
+try {
+  http2 = require('node:http2')
+} catch {
+  // @ts-ignore
+  http2 = { constants: {} }
+}
+
+const {
+  constants: {
+    HTTP2_HEADER_AUTHORITY,
+    HTTP2_HEADER_METHOD,
+    HTTP2_HEADER_PATH,
+    HTTP2_HEADER_SCHEME,
+    HTTP2_HEADER_CONTENT_LENGTH,
+    HTTP2_HEADER_EXPECT,
+    HTTP2_HEADER_STATUS,
+    HTTP2_HEADER_PROTOCOL,
+    NGHTTP2_REFUSED_STREAM,
+    NGHTTP2_CANCEL
+  }
+} = http2
+
+function parseH2Headers (headers) {
+  const result = []
+
+  for (const [name, value] of Object.entries(headers)) {
+    // h2 may concat the header value by array
+    // e.g. Set-Cookie
+    if (Array.isArray(value)) {
+      for (const subvalue of value) {
+        // we need to provide each header value of header name
+        // because the headers handler expect name-value pair
+        result.push(Buffer.from(name), Buffer.from(subvalue))
+      }
+    } else {
+      result.push(Buffer.from(name), Buffer.from(value))
+    }
+  }
+
+  return result
+}
+
+function connectH2 (client, socket) {
+  client[kSocket] = socket
+
+  const http2InitialWindowSize = client[kHTTP2InitialWindowSize]
+  const http2ConnectionWindowSize = client[kHTTP2ConnectionWindowSize]
+
+  const session = http2.connect(client[kUrl], {
+    createConnection: () => socket,
+    peerMaxConcurrentStreams: client[kMaxConcurrentStreams],
+    settings: {
+      // TODO(metcoder95): add support for PUSH
+      enablePush: false,
+      ...(http2InitialWindowSize != null ? { initialWindowSize: http2InitialWindowSize } : null)
+    }
+  })
+
+  client[kSocket] = socket
+  session[kOpenStreams] = 0
+  session[kClient] = client
+  session[kSocket] = socket
+  session[kHTTP2SessionState] = {
+    ping: {
+      interval: client[kPingInterval] === 0 ? null : setInterval(onHttp2SendPing, client[kPingInterval], session).unref()
+    }
+  }
+  // We set it to true by default in a best-effort; however once connected to an H2 server
+  // we will check if extended CONNECT protocol is supported or not
+  // and set this value accordingly.
+  session[kEnableConnectProtocol] = false
+  // States whether or not we have received the remote settings from the server
+  session[kRemoteSettings] = false
+
+  // Apply connection-level flow control once connected (if supported).
+  if (http2ConnectionWindowSize) {
+    util.addListener(session, 'connect', applyConnectionWindowSize.bind(session, http2ConnectionWindowSize))
+  }
+
+  util.addListener(session, 'error', onHttp2SessionError)
+  util.addListener(session, 'frameError', onHttp2FrameError)
+  util.addListener(session, 'end', onHttp2SessionEnd)
+  util.addListener(session, 'goaway', onHttp2SessionGoAway)
+  util.addListener(session, 'close', onHttp2SessionClose)
+  util.addListener(session, 'remoteSettings', onHttp2RemoteSettings)
+  // TODO (@metcoder95): implement SETTINGS support
+  // util.addListener(session, 'localSettings', onHttp2RemoteSettings)
+
+  session.unref()
+
+  client[kHTTP2Session] = session
+  socket[kHTTP2Session] = session
+
+  util.addListener(socket, 'error', onHttp2SocketError)
+  util.addListener(socket, 'end', onHttp2SocketEnd)
+  util.addListener(socket, 'close', onHttp2SocketClose)
+
+  socket[kClosed] = false
+  socket.on('close', onSocketClose)
+
+  return {
+    version: 'h2',
+    defaultPipelining: Infinity,
+    /**
+     * @param {import('../core/request.js')} request
+     * @returns {boolean}
+    */
+    write (request) {
+      return writeH2(client, request)
+    },
+    /**
+     * @returns {void}
+     */
+    resume () {
+      resumeH2(client)
+    },
+    /**
+     * @param {Error | null} err
+     * @param {() => void} callback
+     */
+    destroy (err, callback) {
+      if (socket[kClosed]) {
+        queueMicrotask(callback)
+      } else {
+        socket.destroy(err).on('close', callback)
+      }
+    },
+    /**
+     * @type {boolean}
+     */
+    get destroyed () {
+      return socket.destroyed
+    },
+    /**
+     * @param {import('../core/request.js')} request
+     * @returns {boolean}
+    */
+    busy (request) {
+      if (request != null) {
+        if (client[kRunning] > 0) {
+          // We are already processing requests
+
+          // Non-idempotent request cannot be retried.
+          // Ensure that no other requests are inflight and
+          // could cause failure.
+          if (request.idempotent === false) return true
+          // Don't dispatch an upgrade until all preceding requests have completed.
+          // Possibly, we do not have remote settings confirmed yet.
+          if ((request.upgrade === 'websocket' || request.method === 'CONNECT') && session[kRemoteSettings] === false) return true
+          // Request with stream or iterator body can error while other requests
+          // are inflight and indirectly error those as well.
+          // Ensure this doesn't happen by waiting for inflight
+          // to complete before dispatching.
+
+          // Request with stream or iterator body cannot be retried.
+          // Ensure that no other requests are inflight and
+          // could cause failure.
+          if (util.bodyLength(request.body) !== 0 &&
+            (util.isStream(request.body) || util.isAsyncIterable(request.body) || util.isFormDataLike(request.body))) return true
+        } else {
+          return (request.upgrade === 'websocket' || request.method === 'CONNECT') && session[kRemoteSettings] === false
+        }
+      }
+
+      return false
+    }
+  }
+}
+
+function resumeH2 (client) {
+  const socket = client[kSocket]
+
+  if (socket?.destroyed === false) {
+    if (client[kSize] === 0 || client[kMaxConcurrentStreams] === 0) {
+      socket.unref()
+      client[kHTTP2Session].unref()
+    } else {
+      socket.ref()
+      client[kHTTP2Session].ref()
+    }
+  }
+}
+
+function applyConnectionWindowSize (connectionWindowSize) {
+  try {
+    if (typeof this.setLocalWindowSize === 'function') {
+      this.setLocalWindowSize(connectionWindowSize)
+    }
+  } catch {
+    // Best-effort only.
+  }
+}
+
+function onHttp2RemoteSettings (settings) {
+  // Fallbacks are a safe bet, remote setting will always override
+  this[kClient][kMaxConcurrentStreams] = settings.maxConcurrentStreams ?? this[kClient][kMaxConcurrentStreams]
+  /**
+   * From RFC-8441
+   * A sender MUST NOT send a SETTINGS_ENABLE_CONNECT_PROTOCOL parameter
+   * with the value of 0 after previously sending a value of 1.
+   */
+  // Note: Cannot be tested in Node, it does not supports disabling the extended CONNECT protocol once enabled
+  if (this[kRemoteSettings] === true && this[kEnableConnectProtocol] === true && settings.enableConnectProtocol === false) {
+    const err = new InformationalError('HTTP/2: Server disabled extended CONNECT protocol against RFC-8441')
+    this[kSocket][kError] = err
+    this[kClient][kOnError](err)
+    return
+  }
+
+  this[kEnableConnectProtocol] = settings.enableConnectProtocol ?? this[kEnableConnectProtocol]
+  this[kRemoteSettings] = true
+  this[kClient][kResume]()
+}
+
+function onHttp2SendPing (session) {
+  const state = session[kHTTP2SessionState]
+  if ((session.closed || session.destroyed) && state.ping.interval != null) {
+    clearInterval(state.ping.interval)
+    state.ping.interval = null
+    return
+  }
+
+  // If no ping sent, do nothing
+  session.ping(onPing.bind(session))
+
+  function onPing (err, duration) {
+    const client = this[kClient]
+    const socket = this[kClient]
+
+    if (err != null) {
+      const error = new InformationalError(`HTTP/2: "PING" errored - type ${err.message}`)
+      socket[kError] = error
+      client[kOnError](error)
+    } else {
+      client.emit('ping', duration)
+    }
+  }
+}
+
+function onHttp2SessionError (err) {
+  assert(err.code !== 'ERR_TLS_CERT_ALTNAME_INVALID')
+
+  this[kSocket][kError] = err
+  this[kClient][kOnError](err)
+}
+
+function onHttp2FrameError (type, code, id) {
+  if (id === 0) {
+    const err = new InformationalError(`HTTP/2: "frameError" received - type ${type}, code ${code}`)
+    this[kSocket][kError] = err
+    this[kClient][kOnError](err)
+  }
+}
+
+function onHttp2SessionEnd () {
+  const err = new SocketError('other side closed', util.getSocketInfo(this[kSocket]))
+  this.destroy(err)
+  util.destroy(this[kSocket], err)
+}
+
+/**
+ * This is the root cause of #3011
+ * We need to handle GOAWAY frames properly, and trigger the session close
+ * along with the socket right away
+ *
+ * @this {import('http2').ClientHttp2Session}
+ * @param {number} errorCode
+ */
+function onHttp2SessionGoAway (errorCode) {
+  // TODO(mcollina): Verify if GOAWAY implements the spec correctly:
+  // https://datatracker.ietf.org/doc/html/rfc7540#section-6.8
+  // Specifically, we do not verify the "valid" stream id.
+
+  const err = this[kError] || new SocketError(`HTTP/2: "GOAWAY" frame received with code ${errorCode}`, util.getSocketInfo(this[kSocket]))
+  const client = this[kClient]
+
+  client[kSocket] = null
+  client[kHTTPContext] = null
+
+  // this is an HTTP2 session
+  this.close()
+  this[kHTTP2Session] = null
+
+  util.destroy(this[kSocket], err)
+
+  // Fail head of pipeline.
+  if (client[kRunningIdx] < client[kQueue].length) {
+    const request = client[kQueue][client[kRunningIdx]]
+    client[kQueue][client[kRunningIdx]++] = null
+    util.errorRequest(client, request, err)
+    client[kPendingIdx] = client[kRunningIdx]
+  }
+
+  assert(client[kRunning] === 0)
+
+  client.emit('disconnect', client[kUrl], [client], err)
+  client.emit('connectionError', client[kUrl], [client], err)
+
+  client[kResume]()
+}
+
+function onHttp2SessionClose () {
+  const { [kClient]: client, [kHTTP2SessionState]: state } = this
+  const { [kSocket]: socket } = client
+
+  const err = this[kSocket][kError] || this[kError] || new SocketError('closed', util.getSocketInfo(socket))
+
+  client[kSocket] = null
+  client[kHTTPContext] = null
+
+  if (state.ping.interval != null) {
+    clearInterval(state.ping.interval)
+    state.ping.interval = null
+  }
+
+  if (client.destroyed) {
+    assert(client[kPending] === 0)
+
+    // Fail entire queue.
+    const requests = client[kQueue].splice(client[kRunningIdx])
+    for (let i = 0; i < requests.length; i++) {
+      const request = requests[i]
+      util.errorRequest(client, request, err)
+    }
+  }
+}
+
+function onHttp2SocketClose () {
+  const err = this[kError] || new SocketError('closed', util.getSocketInfo(this))
+
+  const client = this[kHTTP2Session][kClient]
+
+  client[kSocket] = null
+  client[kHTTPContext] = null
+
+  if (this[kHTTP2Session] !== null) {
+    this[kHTTP2Session].destroy(err)
+  }
+
+  client[kPendingIdx] = client[kRunningIdx]
+
+  assert(client[kRunning] === 0)
+
+  client.emit('disconnect', client[kUrl], [client], err)
+
+  client[kResume]()
+}
+
+function onHttp2SocketError (err) {
+  assert(err.code !== 'ERR_TLS_CERT_ALTNAME_INVALID')
+
+  this[kError] = err
+
+  this[kClient][kOnError](err)
+}
+
+function onHttp2SocketEnd () {
+  util.destroy(this, new SocketError('other side closed', util.getSocketInfo(this)))
+}
+
+function onSocketClose () {
+  this[kClosed] = true
+}
+
+// https://www.rfc-editor.org/rfc/rfc7230#section-3.3.2
+function shouldSendContentLength (method) {
+  return method !== 'GET' && method !== 'HEAD' && method !== 'OPTIONS' && method !== 'TRACE' && method !== 'CONNECT'
+}
+
+function writeH2 (client, request) {
+  const requestTimeout = request.bodyTimeout ?? client[kBodyTimeout]
+  const session = client[kHTTP2Session]
+  const { method, path, host, upgrade, expectContinue, signal, protocol, headers: reqHeaders } = request
+  let { body } = request
+
+  if (upgrade != null && upgrade !== 'websocket') {
+    util.errorRequest(client, request, new InvalidArgumentError(`Custom upgrade "${upgrade}" not supported over HTTP/2`))
+    return false
+  }
+
+  const headers = {}
+  for (let n = 0; n < reqHeaders.length; n += 2) {
+    const key = reqHeaders[n + 0]
+    const val = reqHeaders[n + 1]
+
+    if (key === 'cookie') {
+      if (headers[key] != null) {
+        headers[key] = Array.isArray(headers[key]) ? (headers[key].push(val), headers[key]) : [headers[key], val]
+      } else {
+        headers[key] = val
+      }
+
+      continue
+    }
+
+    if (Array.isArray(val)) {
+      for (let i = 0; i < val.length; i++) {
+        if (headers[key]) {
+          headers[key] += `, ${val[i]}`
+        } else {
+          headers[key] = val[i]
+        }
+      }
+    } else if (headers[key]) {
+      headers[key] += `, ${val}`
+    } else {
+      headers[key] = val
+    }
+  }
+
+  /** @type {import('node:http2').ClientHttp2Stream} */
+  let stream = null
+
+  const { hostname, port } = client[kUrl]
+
+  headers[HTTP2_HEADER_AUTHORITY] = host || `${hostname}${port ? `:${port}` : ''}`
+  headers[HTTP2_HEADER_METHOD] = method
+
+  const abort = (err) => {
+    if (request.aborted || request.completed) {
+      return
+    }
+
+    err = err || new RequestAbortedError()
+
+    util.errorRequest(client, request, err)
+
+    if (stream != null) {
+      // Some chunks might still come after abort,
+      // let's ignore them
+      stream.removeAllListeners('data')
+
+      // On Abort, we close the stream to send RST_STREAM frame
+      stream.close()
+
+      // We move the running index to the next request
+      client[kOnError](err)
+      client[kResume]()
+    }
+
+    // We do not destroy the socket as we can continue using the session
+    // the stream gets destroyed and the session remains to create new streams
+    util.destroy(body, err)
+  }
+
+  try {
+    // We are already connected, streams are pending.
+    // We can call on connect, and wait for abort
+    request.onConnect(abort)
+  } catch (err) {
+    util.errorRequest(client, request, err)
+  }
+
+  if (request.aborted) {
+    return false
+  }
+
+  if (upgrade || method === 'CONNECT') {
+    session.ref()
+
+    if (upgrade === 'websocket') {
+      // We cannot upgrade to websocket if extended CONNECT protocol is not supported
+      if (session[kEnableConnectProtocol] === false) {
+        util.errorRequest(client, request, new InformationalError('HTTP/2: Extended CONNECT protocol not supported by server'))
+        session.unref()
+        return false
+      }
+
+      // We force the method to CONNECT
+      // as per RFC-8441
+      // https://datatracker.ietf.org/doc/html/rfc8441#section-4
+      headers[HTTP2_HEADER_METHOD] = 'CONNECT'
+      headers[HTTP2_HEADER_PROTOCOL] = 'websocket'
+      // :path and :scheme headers must be omitted when sending CONNECT but set if extended-CONNECT
+      headers[HTTP2_HEADER_PATH] = path
+
+      if (protocol === 'ws:' || protocol === 'wss:') {
+        headers[HTTP2_HEADER_SCHEME] = protocol === 'ws:' ? 'http' : 'https'
+      } else {
+        headers[HTTP2_HEADER_SCHEME] = protocol === 'http:' ? 'http' : 'https'
+      }
+
+      stream = session.request(headers, { endStream: false, signal })
+      stream[kHTTP2Stream] = true
+
+      stream.once('response', (headers, _flags) => {
+        const { [HTTP2_HEADER_STATUS]: statusCode, ...realHeaders } = headers
+
+        request.onUpgrade(statusCode, parseH2Headers(realHeaders), stream)
+
+        ++session[kOpenStreams]
+        client[kQueue][client[kRunningIdx]++] = null
+      })
+
+      stream.on('error', () => {
+        if (stream.rstCode === NGHTTP2_REFUSED_STREAM || stream.rstCode === NGHTTP2_CANCEL) {
+          // NGHTTP2_REFUSED_STREAM (7) or NGHTTP2_CANCEL (8)
+          // We do not treat those as errors as the server might
+          // not support websockets and refuse the stream
+          abort(new InformationalError(`HTTP/2: "stream error" received - code ${stream.rstCode}`))
+        }
+      })
+
+      stream.once('close', () => {
+        session[kOpenStreams] -= 1
+        if (session[kOpenStreams] === 0) session.unref()
+      })
+
+      stream.setTimeout(requestTimeout)
+      return true
+    }
+
+    // TODO: consolidate once we support CONNECT properly
+    // NOTE: We are already connected, streams are pending, first request
+    // will create a new stream. We trigger a request to create the stream and wait until
+    // `ready` event is triggered
+    // We disabled endStream to allow the user to write to the stream
+    stream = session.request(headers, { endStream: false, signal })
+    stream[kHTTP2Stream] = true
+    stream.on('response', headers => {
+      const { [HTTP2_HEADER_STATUS]: statusCode, ...realHeaders } = headers
+
+      request.onUpgrade(statusCode, parseH2Headers(realHeaders), stream)
+      ++session[kOpenStreams]
+      client[kQueue][client[kRunningIdx]++] = null
+    })
+    stream.once('close', () => {
+      session[kOpenStreams] -= 1
+      if (session[kOpenStreams] === 0) session.unref()
+    })
+    stream.setTimeout(requestTimeout)
+
+    return true
+  }
+
+  // https://tools.ietf.org/html/rfc7540#section-8.3
+  // :path and :scheme headers must be omitted when sending CONNECT
+  headers[HTTP2_HEADER_PATH] = path
+  headers[HTTP2_HEADER_SCHEME] = protocol === 'http:' ? 'http' : 'https'
+
+  // https://tools.ietf.org/html/rfc7231#section-4.3.1
+  // https://tools.ietf.org/html/rfc7231#section-4.3.2
+  // https://tools.ietf.org/html/rfc7231#section-4.3.5
+
+  // Sending a payload body on a request that does not
+  // expect it can cause undefined behavior on some
+  // servers and corrupt connection state. Do not
+  // re-use the connection for further requests.
+
+  const expectsPayload = (
+    method === 'PUT' ||
+    method === 'POST' ||
+    method === 'PATCH'
+  )
+
+  if (body && typeof body.read === 'function') {
+    // Try to read EOF in order to get length.
+    body.read(0)
+  }
+
+  let contentLength = util.bodyLength(body)
+
+  if (util.isFormDataLike(body)) {
+    extractBody ??= require('../web/fetch/body.js').extractBody
+
+    const [bodyStream, contentType] = extractBody(body)
+    headers['content-type'] = contentType
+
+    body = bodyStream.stream
+    contentLength = bodyStream.length
+  }
+
+  if (contentLength == null) {
+    contentLength = request.contentLength
+  }
+
+  if (!expectsPayload) {
+    // https://tools.ietf.org/html/rfc7230#section-3.3.2
+    // A user agent SHOULD NOT send a Content-Length header field when
+    // the request message does not contain a payload body and the method
+    // semantics do not anticipate such a body.
+    // And for methods that don't expect a payload, omit Content-Length.
+    contentLength = null
+  }
+
+  // https://github.com/nodejs/undici/issues/2046
+  // A user agent may send a Content-Length header with 0 value, this should be allowed.
+  if (shouldSendContentLength(method) && contentLength > 0 && request.contentLength != null && request.contentLength !== contentLength) {
+    if (client[kStrictContentLength]) {
+      util.errorRequest(client, request, new RequestContentLengthMismatchError())
+      return false
+    }
+
+    process.emitWarning(new RequestContentLengthMismatchError())
+  }
+
+  if (contentLength != null) {
+    assert(body || contentLength === 0, 'no body must not have content length')
+    headers[HTTP2_HEADER_CONTENT_LENGTH] = `${contentLength}`
+  }
+
+  session.ref()
+
+  if (channels.sendHeaders.hasSubscribers) {
+    let header = ''
+    for (const key in headers) {
+      header += `${key}: ${headers[key]}\r\n`
+    }
+    channels.sendHeaders.publish({ request, headers: header, socket: session[kSocket] })
+  }
+
+  // TODO(metcoder95): add support for sending trailers
+  const shouldEndStream = method === 'GET' || method === 'HEAD' || body === null
+  if (expectContinue) {
+    headers[HTTP2_HEADER_EXPECT] = '100-continue'
+    stream = session.request(headers, { endStream: shouldEndStream, signal })
+    stream[kHTTP2Stream] = true
+
+    stream.once('continue', writeBodyH2)
+  } else {
+    stream = session.request(headers, {
+      endStream: shouldEndStream,
+      signal
+    })
+    stream[kHTTP2Stream] = true
+
+    writeBodyH2()
+  }
+
+  // Increment counter as we have new streams open
+  ++session[kOpenStreams]
+  stream.setTimeout(requestTimeout)
+
+  // Track whether we received a response (headers)
+  let responseReceived = false
+
+  stream.once('response', headers => {
+    const { [HTTP2_HEADER_STATUS]: statusCode, ...realHeaders } = headers
+    request.onResponseStarted()
+    responseReceived = true
+
+    // Due to the stream nature, it is possible we face a race condition
+    // where the stream has been assigned, but the request has been aborted
+    // the request remains in-flight and headers hasn't been received yet
+    // for those scenarios, best effort is to destroy the stream immediately
+    // as there's no value to keep it open.
+    if (request.aborted) {
+      stream.removeAllListeners('data')
+      return
+    }
+
+    if (request.onHeaders(Number(statusCode), parseH2Headers(realHeaders), stream.resume.bind(stream), '') === false) {
+      stream.pause()
+    }
+  })
+
+  stream.on('data', (chunk) => {
+    if (request.onData(chunk) === false) {
+      stream.pause()
+    }
+  })
+
+  stream.once('end', () => {
+    stream.removeAllListeners('data')
+    // If we received a response, this is a normal completion
+    if (responseReceived) {
+      if (!request.aborted && !request.completed) {
+        request.onComplete({})
+      }
+
+      client[kQueue][client[kRunningIdx]++] = null
+      client[kResume]()
+    } else {
+      // Stream ended without receiving a response - this is an error
+      // (e.g., server destroyed the stream before sending headers)
+      abort(new InformationalError('HTTP/2: stream half-closed (remote)'))
+      client[kQueue][client[kRunningIdx]++] = null
+      client[kPendingIdx] = client[kRunningIdx]
+      client[kResume]()
+    }
+  })
+
+  stream.once('close', () => {
+    stream.removeAllListeners('data')
+    session[kOpenStreams] -= 1
+    if (session[kOpenStreams] === 0) {
+      session.unref()
+    }
+  })
+
+  stream.once('error', function (err) {
+    stream.removeAllListeners('data')
+    abort(err)
+  })
+
+  stream.once('frameError', (type, code) => {
+    stream.removeAllListeners('data')
+    abort(new InformationalError(`HTTP/2: "frameError" received - type ${type}, code ${code}`))
+  })
+
+  stream.on('aborted', () => {
+    stream.removeAllListeners('data')
+  })
+
+  stream.on('timeout', () => {
+    const err = new InformationalError(`HTTP/2: "stream timeout after ${requestTimeout}"`)
+    stream.removeAllListeners('data')
+    session[kOpenStreams] -= 1
+
+    if (session[kOpenStreams] === 0) {
+      session.unref()
+    }
+
+    abort(err)
+  })
+
+  stream.once('trailers', trailers => {
+    if (request.aborted || request.completed) {
+      return
+    }
+
+    request.onComplete(trailers)
+  })
+
+  return true
+
+  function writeBodyH2 () {
+    if (!body || contentLength === 0) {
+      writeBuffer(
+        abort,
+        stream,
+        null,
+        client,
+        request,
+        client[kSocket],
+        contentLength,
+        expectsPayload
+      )
+    } else if (util.isBuffer(body)) {
+      writeBuffer(
+        abort,
+        stream,
+        body,
+        client,
+        request,
+        client[kSocket],
+        contentLength,
+        expectsPayload
+      )
+    } else if (util.isBlobLike(body)) {
+      if (typeof body.stream === 'function') {
+        writeIterable(
+          abort,
+          stream,
+          body.stream(),
+          client,
+          request,
+          client[kSocket],
+          contentLength,
+          expectsPayload
+        )
+      } else {
+        writeBlob(
+          abort,
+          stream,
+          body,
+          client,
+          request,
+          client[kSocket],
+          contentLength,
+          expectsPayload
+        )
+      }
+    } else if (util.isStream(body)) {
+      writeStream(
+        abort,
+        client[kSocket],
+        expectsPayload,
+        stream,
+        body,
+        client,
+        request,
+        contentLength
+      )
+    } else if (util.isIterable(body)) {
+      writeIterable(
+        abort,
+        stream,
+        body,
+        client,
+        request,
+        client[kSocket],
+        contentLength,
+        expectsPayload
+      )
+    } else {
+      assert(false)
+    }
+  }
+}
+
+function writeBuffer (abort, h2stream, body, client, request, socket, contentLength, expectsPayload) {
+  try {
+    if (body != null && util.isBuffer(body)) {
+      assert(contentLength === body.byteLength, 'buffer body must have content length')
+      h2stream.cork()
+      h2stream.write(body)
+      h2stream.uncork()
+      h2stream.end()
+
+      request.onBodySent(body)
+    }
+
+    if (!expectsPayload) {
+      socket[kReset] = true
+    }
+
+    request.onRequestSent()
+    client[kResume]()
+  } catch (error) {
+    abort(error)
+  }
+}
+
+function writeStream (abort, socket, expectsPayload, h2stream, body, client, request, contentLength) {
+  assert(contentLength !== 0 || client[kRunning] === 0, 'stream body cannot be pipelined')
+
+  // For HTTP/2, is enough to pipe the stream
+  const pipe = pipeline(
+    body,
+    h2stream,
+    (err) => {
+      if (err) {
+        util.destroy(pipe, err)
+        abort(err)
+      } else {
+        util.removeAllListeners(pipe)
+        request.onRequestSent()
+
+        if (!expectsPayload) {
+          socket[kReset] = true
+        }
+
+        client[kResume]()
+      }
+    }
+  )
+
+  util.addListener(pipe, 'data', onPipeData)
+
+  function onPipeData (chunk) {
+    request.onBodySent(chunk)
+  }
+}
+
+async function writeBlob (abort, h2stream, body, client, request, socket, contentLength, expectsPayload) {
+  assert(contentLength === body.size, 'blob body must have content length')
+
+  try {
+    if (contentLength != null && contentLength !== body.size) {
+      throw new RequestContentLengthMismatchError()
+    }
+
+    const buffer = Buffer.from(await body.arrayBuffer())
+
+    h2stream.cork()
+    h2stream.write(buffer)
+    h2stream.uncork()
+    h2stream.end()
+
+    request.onBodySent(buffer)
+    request.onRequestSent()
+
+    if (!expectsPayload) {
+      socket[kReset] = true
+    }
+
+    client[kResume]()
+  } catch (err) {
+    abort(err)
+  }
+}
+
+async function writeIterable (abort, h2stream, body, client, request, socket, contentLength, expectsPayload) {
+  assert(contentLength !== 0 || client[kRunning] === 0, 'iterator body cannot be pipelined')
+
+  let callback = null
+  function onDrain () {
+    if (callback) {
+      const cb = callback
+      callback = null
+      cb()
+    }
+  }
+
+  const waitForDrain = () => new Promise((resolve, reject) => {
+    assert(callback === null)
+
+    if (socket[kError]) {
+      reject(socket[kError])
+    } else {
+      callback = resolve
+    }
+  })
+
+  h2stream
+    .on('close', onDrain)
+    .on('drain', onDrain)
+
+  try {
+    // It's up to the user to somehow abort the async iterable.
+    for await (const chunk of body) {
+      if (socket[kError]) {
+        throw socket[kError]
+      }
+
+      const res = h2stream.write(chunk)
+      request.onBodySent(chunk)
+      if (!res) {
+        await waitForDrain()
+      }
+    }
+
+    h2stream.end()
+
+    request.onRequestSent()
+
+    if (!expectsPayload) {
+      socket[kReset] = true
+    }
+
+    client[kResume]()
+  } catch (err) {
+    abort(err)
+  } finally {
+    h2stream
+      .off('close', onDrain)
+      .off('drain', onDrain)
+  }
+}
+
+module.exports = connectH2
diff --git a/vanilla/node_modules/undici/lib/dispatcher/client.js b/vanilla/node_modules/undici/lib/dispatcher/client.js
new file mode 100644
index 0000000..101acb6
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/client.js
@@ -0,0 +1,647 @@
+'use strict'
+
+const assert = require('node:assert')
+const net = require('node:net')
+const http = require('node:http')
+const util = require('../core/util.js')
+const { ClientStats } = require('../util/stats.js')
+const { channels } = require('../core/diagnostics.js')
+const Request = require('../core/request.js')
+const DispatcherBase = require('./dispatcher-base')
+const {
+  InvalidArgumentError,
+  InformationalError,
+  ClientDestroyedError
+} = require('../core/errors.js')
+const buildConnector = require('../core/connect.js')
+const {
+  kUrl,
+  kServerName,
+  kClient,
+  kBusy,
+  kConnect,
+  kResuming,
+  kRunning,
+  kPending,
+  kSize,
+  kQueue,
+  kConnected,
+  kConnecting,
+  kNeedDrain,
+  kKeepAliveDefaultTimeout,
+  kHostHeader,
+  kPendingIdx,
+  kRunningIdx,
+  kError,
+  kPipelining,
+  kKeepAliveTimeoutValue,
+  kMaxHeadersSize,
+  kKeepAliveMaxTimeout,
+  kKeepAliveTimeoutThreshold,
+  kHeadersTimeout,
+  kBodyTimeout,
+  kStrictContentLength,
+  kConnector,
+  kMaxRequests,
+  kCounter,
+  kClose,
+  kDestroy,
+  kDispatch,
+  kLocalAddress,
+  kMaxResponseSize,
+  kOnError,
+  kHTTPContext,
+  kMaxConcurrentStreams,
+  kHTTP2InitialWindowSize,
+  kHTTP2ConnectionWindowSize,
+  kResume,
+  kPingInterval
+} = require('../core/symbols.js')
+const connectH1 = require('./client-h1.js')
+const connectH2 = require('./client-h2.js')
+
+const kClosedResolve = Symbol('kClosedResolve')
+
+const getDefaultNodeMaxHeaderSize = http &&
+  http.maxHeaderSize &&
+  Number.isInteger(http.maxHeaderSize) &&
+  http.maxHeaderSize > 0
+  ? () => http.maxHeaderSize
+  : () => { throw new InvalidArgumentError('http module not available or http.maxHeaderSize invalid') }
+
+const noop = () => {}
+
+function getPipelining (client) {
+  return client[kPipelining] ?? client[kHTTPContext]?.defaultPipelining ?? 1
+}
+
+/**
+ * @type {import('../../types/client.js').default}
+ */
+class Client extends DispatcherBase {
+  /**
+   *
+   * @param {string|URL} url
+   * @param {import('../../types/client.js').Client.Options} options
+   */
+  constructor (url, {
+    maxHeaderSize,
+    headersTimeout,
+    socketTimeout,
+    requestTimeout,
+    connectTimeout,
+    bodyTimeout,
+    idleTimeout,
+    keepAlive,
+    keepAliveTimeout,
+    maxKeepAliveTimeout,
+    keepAliveMaxTimeout,
+    keepAliveTimeoutThreshold,
+    socketPath,
+    pipelining,
+    tls,
+    strictContentLength,
+    maxCachedSessions,
+    connect,
+    maxRequestsPerClient,
+    localAddress,
+    maxResponseSize,
+    autoSelectFamily,
+    autoSelectFamilyAttemptTimeout,
+    // h2
+    maxConcurrentStreams,
+    allowH2,
+    useH2c,
+    initialWindowSize,
+    connectionWindowSize,
+    pingInterval
+  } = {}) {
+    if (keepAlive !== undefined) {
+      throw new InvalidArgumentError('unsupported keepAlive, use pipelining=0 instead')
+    }
+
+    if (socketTimeout !== undefined) {
+      throw new InvalidArgumentError('unsupported socketTimeout, use headersTimeout & bodyTimeout instead')
+    }
+
+    if (requestTimeout !== undefined) {
+      throw new InvalidArgumentError('unsupported requestTimeout, use headersTimeout & bodyTimeout instead')
+    }
+
+    if (idleTimeout !== undefined) {
+      throw new InvalidArgumentError('unsupported idleTimeout, use keepAliveTimeout instead')
+    }
+
+    if (maxKeepAliveTimeout !== undefined) {
+      throw new InvalidArgumentError('unsupported maxKeepAliveTimeout, use keepAliveMaxTimeout instead')
+    }
+
+    if (maxHeaderSize != null) {
+      if (!Number.isInteger(maxHeaderSize) || maxHeaderSize < 1) {
+        throw new InvalidArgumentError('invalid maxHeaderSize')
+      }
+    } else {
+      // If maxHeaderSize is not provided, use the default value from the http module
+      // or if that is not available, throw an error.
+      maxHeaderSize = getDefaultNodeMaxHeaderSize()
+    }
+
+    if (socketPath != null && typeof socketPath !== 'string') {
+      throw new InvalidArgumentError('invalid socketPath')
+    }
+
+    if (connectTimeout != null && (!Number.isFinite(connectTimeout) || connectTimeout < 0)) {
+      throw new InvalidArgumentError('invalid connectTimeout')
+    }
+
+    if (keepAliveTimeout != null && (!Number.isFinite(keepAliveTimeout) || keepAliveTimeout <= 0)) {
+      throw new InvalidArgumentError('invalid keepAliveTimeout')
+    }
+
+    if (keepAliveMaxTimeout != null && (!Number.isFinite(keepAliveMaxTimeout) || keepAliveMaxTimeout <= 0)) {
+      throw new InvalidArgumentError('invalid keepAliveMaxTimeout')
+    }
+
+    if (keepAliveTimeoutThreshold != null && !Number.isFinite(keepAliveTimeoutThreshold)) {
+      throw new InvalidArgumentError('invalid keepAliveTimeoutThreshold')
+    }
+
+    if (headersTimeout != null && (!Number.isInteger(headersTimeout) || headersTimeout < 0)) {
+      throw new InvalidArgumentError('headersTimeout must be a positive integer or zero')
+    }
+
+    if (bodyTimeout != null && (!Number.isInteger(bodyTimeout) || bodyTimeout < 0)) {
+      throw new InvalidArgumentError('bodyTimeout must be a positive integer or zero')
+    }
+
+    if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
+      throw new InvalidArgumentError('connect must be a function or an object')
+    }
+
+    if (maxRequestsPerClient != null && (!Number.isInteger(maxRequestsPerClient) || maxRequestsPerClient < 0)) {
+      throw new InvalidArgumentError('maxRequestsPerClient must be a positive number')
+    }
+
+    if (localAddress != null && (typeof localAddress !== 'string' || net.isIP(localAddress) === 0)) {
+      throw new InvalidArgumentError('localAddress must be valid string IP address')
+    }
+
+    if (maxResponseSize != null && (!Number.isInteger(maxResponseSize) || maxResponseSize < -1)) {
+      throw new InvalidArgumentError('maxResponseSize must be a positive number')
+    }
+
+    if (
+      autoSelectFamilyAttemptTimeout != null &&
+      (!Number.isInteger(autoSelectFamilyAttemptTimeout) || autoSelectFamilyAttemptTimeout < -1)
+    ) {
+      throw new InvalidArgumentError('autoSelectFamilyAttemptTimeout must be a positive number')
+    }
+
+    // h2
+    if (allowH2 != null && typeof allowH2 !== 'boolean') {
+      throw new InvalidArgumentError('allowH2 must be a valid boolean value')
+    }
+
+    if (maxConcurrentStreams != null && (typeof maxConcurrentStreams !== 'number' || maxConcurrentStreams < 1)) {
+      throw new InvalidArgumentError('maxConcurrentStreams must be a positive integer, greater than 0')
+    }
+
+    if (useH2c != null && typeof useH2c !== 'boolean') {
+      throw new InvalidArgumentError('useH2c must be a valid boolean value')
+    }
+
+    if (initialWindowSize != null && (!Number.isInteger(initialWindowSize) || initialWindowSize < 1)) {
+      throw new InvalidArgumentError('initialWindowSize must be a positive integer, greater than 0')
+    }
+
+    if (connectionWindowSize != null && (!Number.isInteger(connectionWindowSize) || connectionWindowSize < 1)) {
+      throw new InvalidArgumentError('connectionWindowSize must be a positive integer, greater than 0')
+    }
+
+    if (pingInterval != null && (typeof pingInterval !== 'number' || !Number.isInteger(pingInterval) || pingInterval < 0)) {
+      throw new InvalidArgumentError('pingInterval must be a positive integer, greater or equal to 0')
+    }
+
+    super()
+
+    if (typeof connect !== 'function') {
+      connect = buildConnector({
+        ...tls,
+        maxCachedSessions,
+        allowH2,
+        useH2c,
+        socketPath,
+        timeout: connectTimeout,
+        ...(typeof autoSelectFamily === 'boolean' ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
+        ...connect
+      })
+    }
+
+    this[kUrl] = util.parseOrigin(url)
+    this[kConnector] = connect
+    this[kPipelining] = pipelining != null ? pipelining : 1
+    this[kMaxHeadersSize] = maxHeaderSize
+    this[kKeepAliveDefaultTimeout] = keepAliveTimeout == null ? 4e3 : keepAliveTimeout
+    this[kKeepAliveMaxTimeout] = keepAliveMaxTimeout == null ? 600e3 : keepAliveMaxTimeout
+    this[kKeepAliveTimeoutThreshold] = keepAliveTimeoutThreshold == null ? 2e3 : keepAliveTimeoutThreshold
+    this[kKeepAliveTimeoutValue] = this[kKeepAliveDefaultTimeout]
+    this[kServerName] = null
+    this[kLocalAddress] = localAddress != null ? localAddress : null
+    this[kResuming] = 0 // 0, idle, 1, scheduled, 2 resuming
+    this[kNeedDrain] = 0 // 0, idle, 1, scheduled, 2 resuming
+    this[kHostHeader] = `host: ${this[kUrl].hostname}${this[kUrl].port ? `:${this[kUrl].port}` : ''}\r\n`
+    this[kBodyTimeout] = bodyTimeout != null ? bodyTimeout : 300e3
+    this[kHeadersTimeout] = headersTimeout != null ? headersTimeout : 300e3
+    this[kStrictContentLength] = strictContentLength == null ? true : strictContentLength
+    this[kMaxRequests] = maxRequestsPerClient
+    this[kClosedResolve] = null
+    this[kMaxResponseSize] = maxResponseSize > -1 ? maxResponseSize : -1
+    this[kHTTPContext] = null
+    // h2
+    this[kMaxConcurrentStreams] = maxConcurrentStreams != null ? maxConcurrentStreams : 100 // Max peerConcurrentStreams for a Node h2 server
+    // HTTP/2 window sizes are set to higher defaults than Node.js core for better performance:
+    // - initialWindowSize: 262144 (256KB) vs Node.js default 65535 (64KB - 1)
+    //   Allows more data to be sent before requiring acknowledgment, improving throughput
+    //   especially on high-latency networks. This matches common production HTTP/2 servers.
+    // - connectionWindowSize: 524288 (512KB) vs Node.js default (none set)
+    //   Provides better flow control for the entire connection across multiple streams.
+    this[kHTTP2InitialWindowSize] = initialWindowSize != null ? initialWindowSize : 262144
+    this[kHTTP2ConnectionWindowSize] = connectionWindowSize != null ? connectionWindowSize : 524288
+    this[kPingInterval] = pingInterval != null ? pingInterval : 60e3 // Default ping interval for h2 - 1 minute
+
+    // kQueue is built up of 3 sections separated by
+    // the kRunningIdx and kPendingIdx indices.
+    // |   complete   |   running   |   pending   |
+    //                ^ kRunningIdx ^ kPendingIdx ^ kQueue.length
+    // kRunningIdx points to the first running element.
+    // kPendingIdx points to the first pending element.
+    // This implements a fast queue with an amortized
+    // time of O(1).
+
+    this[kQueue] = []
+    this[kRunningIdx] = 0
+    this[kPendingIdx] = 0
+
+    this[kResume] = (sync) => resume(this, sync)
+    this[kOnError] = (err) => onError(this, err)
+  }
+
+  get pipelining () {
+    return this[kPipelining]
+  }
+
+  set pipelining (value) {
+    this[kPipelining] = value
+    this[kResume](true)
+  }
+
+  get stats () {
+    return new ClientStats(this)
+  }
+
+  get [kPending] () {
+    return this[kQueue].length - this[kPendingIdx]
+  }
+
+  get [kRunning] () {
+    return this[kPendingIdx] - this[kRunningIdx]
+  }
+
+  get [kSize] () {
+    return this[kQueue].length - this[kRunningIdx]
+  }
+
+  get [kConnected] () {
+    return !!this[kHTTPContext] && !this[kConnecting] && !this[kHTTPContext].destroyed
+  }
+
+  get [kBusy] () {
+    return Boolean(
+      this[kHTTPContext]?.busy(null) ||
+      (this[kSize] >= (getPipelining(this) || 1)) ||
+      this[kPending] > 0
+    )
+  }
+
+  [kConnect] (cb) {
+    connect(this)
+    this.once('connect', cb)
+  }
+
+  [kDispatch] (opts, handler) {
+    const request = new Request(this[kUrl].origin, opts, handler)
+
+    this[kQueue].push(request)
+    if (this[kResuming]) {
+      // Do nothing.
+    } else if (util.bodyLength(request.body) == null && util.isIterable(request.body)) {
+      // Wait a tick in case stream/iterator is ended in the same tick.
+      this[kResuming] = 1
+      queueMicrotask(() => resume(this))
+    } else {
+      this[kResume](true)
+    }
+
+    if (this[kResuming] && this[kNeedDrain] !== 2 && this[kBusy]) {
+      this[kNeedDrain] = 2
+    }
+
+    return this[kNeedDrain] < 2
+  }
+
+  [kClose] () {
+    // TODO: for H2 we need to gracefully flush the remaining enqueued
+    // request and close each stream.
+    return new Promise((resolve) => {
+      if (this[kSize]) {
+        this[kClosedResolve] = resolve
+      } else {
+        resolve(null)
+      }
+    })
+  }
+
+  [kDestroy] (err) {
+    return new Promise((resolve) => {
+      const requests = this[kQueue].splice(this[kPendingIdx])
+      for (let i = 0; i < requests.length; i++) {
+        const request = requests[i]
+        util.errorRequest(this, request, err)
+      }
+
+      const callback = () => {
+        if (this[kClosedResolve]) {
+          // TODO (fix): Should we error here with ClientDestroyedError?
+          this[kClosedResolve]()
+          this[kClosedResolve] = null
+        }
+        resolve(null)
+      }
+
+      if (this[kHTTPContext]) {
+        this[kHTTPContext].destroy(err, callback)
+        this[kHTTPContext] = null
+      } else {
+        queueMicrotask(callback)
+      }
+
+      this[kResume]()
+    })
+  }
+}
+
+function onError (client, err) {
+  if (
+    client[kRunning] === 0 &&
+    err.code !== 'UND_ERR_INFO' &&
+    err.code !== 'UND_ERR_SOCKET'
+  ) {
+    // Error is not caused by running request and not a recoverable
+    // socket error.
+
+    assert(client[kPendingIdx] === client[kRunningIdx])
+
+    const requests = client[kQueue].splice(client[kRunningIdx])
+
+    for (let i = 0; i < requests.length; i++) {
+      const request = requests[i]
+      util.errorRequest(client, request, err)
+    }
+    assert(client[kSize] === 0)
+  }
+}
+
+/**
+ * @param {Client} client
+ * @returns {void}
+ */
+function connect (client) {
+  assert(!client[kConnecting])
+  assert(!client[kHTTPContext])
+
+  let { host, hostname, protocol, port } = client[kUrl]
+
+  // Resolve ipv6
+  if (hostname[0] === '[') {
+    const idx = hostname.indexOf(']')
+
+    assert(idx !== -1)
+    const ip = hostname.substring(1, idx)
+
+    assert(net.isIPv6(ip))
+    hostname = ip
+  }
+
+  client[kConnecting] = true
+
+  if (channels.beforeConnect.hasSubscribers) {
+    channels.beforeConnect.publish({
+      connectParams: {
+        host,
+        hostname,
+        protocol,
+        port,
+        version: client[kHTTPContext]?.version,
+        servername: client[kServerName],
+        localAddress: client[kLocalAddress]
+      },
+      connector: client[kConnector]
+    })
+  }
+
+  client[kConnector]({
+    host,
+    hostname,
+    protocol,
+    port,
+    servername: client[kServerName],
+    localAddress: client[kLocalAddress]
+  }, (err, socket) => {
+    if (err) {
+      handleConnectError(client, err, { host, hostname, protocol, port })
+      client[kResume]()
+      return
+    }
+
+    if (client.destroyed) {
+      util.destroy(socket.on('error', noop), new ClientDestroyedError())
+      client[kResume]()
+      return
+    }
+
+    assert(socket)
+
+    try {
+      client[kHTTPContext] = socket.alpnProtocol === 'h2'
+        ? connectH2(client, socket)
+        : connectH1(client, socket)
+    } catch (err) {
+      socket.destroy().on('error', noop)
+      handleConnectError(client, err, { host, hostname, protocol, port })
+      client[kResume]()
+      return
+    }
+
+    client[kConnecting] = false
+
+    socket[kCounter] = 0
+    socket[kMaxRequests] = client[kMaxRequests]
+    socket[kClient] = client
+    socket[kError] = null
+
+    if (channels.connected.hasSubscribers) {
+      channels.connected.publish({
+        connectParams: {
+          host,
+          hostname,
+          protocol,
+          port,
+          version: client[kHTTPContext]?.version,
+          servername: client[kServerName],
+          localAddress: client[kLocalAddress]
+        },
+        connector: client[kConnector],
+        socket
+      })
+    }
+
+    client.emit('connect', client[kUrl], [client])
+    client[kResume]()
+  })
+}
+
+function handleConnectError (client, err, { host, hostname, protocol, port }) {
+  if (client.destroyed) {
+    return
+  }
+
+  client[kConnecting] = false
+
+  if (channels.connectError.hasSubscribers) {
+    channels.connectError.publish({
+      connectParams: {
+        host,
+        hostname,
+        protocol,
+        port,
+        version: client[kHTTPContext]?.version,
+        servername: client[kServerName],
+        localAddress: client[kLocalAddress]
+      },
+      connector: client[kConnector],
+      error: err
+    })
+  }
+
+  if (err.code === 'ERR_TLS_CERT_ALTNAME_INVALID') {
+    assert(client[kRunning] === 0)
+    while (client[kPending] > 0 && client[kQueue][client[kPendingIdx]].servername === client[kServerName]) {
+      const request = client[kQueue][client[kPendingIdx]++]
+      util.errorRequest(client, request, err)
+    }
+  } else {
+    onError(client, err)
+  }
+
+  client.emit('connectionError', client[kUrl], [client], err)
+}
+
+function emitDrain (client) {
+  client[kNeedDrain] = 0
+  client.emit('drain', client[kUrl], [client])
+}
+
+function resume (client, sync) {
+  if (client[kResuming] === 2) {
+    return
+  }
+
+  client[kResuming] = 2
+
+  _resume(client, sync)
+  client[kResuming] = 0
+
+  if (client[kRunningIdx] > 256) {
+    client[kQueue].splice(0, client[kRunningIdx])
+    client[kPendingIdx] -= client[kRunningIdx]
+    client[kRunningIdx] = 0
+  }
+}
+
+function _resume (client, sync) {
+  while (true) {
+    if (client.destroyed) {
+      assert(client[kPending] === 0)
+      return
+    }
+
+    if (client[kClosedResolve] && !client[kSize]) {
+      client[kClosedResolve]()
+      client[kClosedResolve] = null
+      return
+    }
+
+    if (client[kHTTPContext]) {
+      client[kHTTPContext].resume()
+    }
+
+    if (client[kBusy]) {
+      client[kNeedDrain] = 2
+    } else if (client[kNeedDrain] === 2) {
+      if (sync) {
+        client[kNeedDrain] = 1
+        queueMicrotask(() => emitDrain(client))
+      } else {
+        emitDrain(client)
+      }
+      continue
+    }
+
+    if (client[kPending] === 0) {
+      return
+    }
+
+    if (client[kRunning] >= (getPipelining(client) || 1)) {
+      return
+    }
+
+    const request = client[kQueue][client[kPendingIdx]]
+
+    if (client[kUrl].protocol === 'https:' && client[kServerName] !== request.servername) {
+      if (client[kRunning] > 0) {
+        return
+      }
+
+      client[kServerName] = request.servername
+      client[kHTTPContext]?.destroy(new InformationalError('servername changed'), () => {
+        client[kHTTPContext] = null
+        resume(client)
+      })
+    }
+
+    if (client[kConnecting]) {
+      return
+    }
+
+    if (!client[kHTTPContext]) {
+      connect(client)
+      return
+    }
+
+    if (client[kHTTPContext].destroyed) {
+      return
+    }
+
+    if (client[kHTTPContext].busy(request)) {
+      return
+    }
+
+    if (!request.aborted && client[kHTTPContext].write(request)) {
+      client[kPendingIdx]++
+    } else {
+      client[kQueue].splice(client[kPendingIdx], 1)
+    }
+  }
+}
+
+module.exports = Client
diff --git a/vanilla/node_modules/undici/lib/dispatcher/dispatcher-base.js b/vanilla/node_modules/undici/lib/dispatcher/dispatcher-base.js
new file mode 100644
index 0000000..a6f4710
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/dispatcher-base.js
@@ -0,0 +1,165 @@
+'use strict'
+
+const Dispatcher = require('./dispatcher')
+const UnwrapHandler = require('../handler/unwrap-handler')
+const {
+  ClientDestroyedError,
+  ClientClosedError,
+  InvalidArgumentError
+} = require('../core/errors')
+const { kDestroy, kClose, kClosed, kDestroyed, kDispatch } = require('../core/symbols')
+
+const kOnDestroyed = Symbol('onDestroyed')
+const kOnClosed = Symbol('onClosed')
+
+class DispatcherBase extends Dispatcher {
+  /** @type {boolean} */
+  [kDestroyed] = false;
+
+  /** @type {Array<Function|null} */
+  [kOnDestroyed] = null;
+
+  /** @type {boolean} */
+  [kClosed] = false;
+
+  /** @type {Array<Function>|null} */
+  [kOnClosed] = null
+
+  /** @returns {boolean} */
+  get destroyed () {
+    return this[kDestroyed]
+  }
+
+  /** @returns {boolean} */
+  get closed () {
+    return this[kClosed]
+  }
+
+  close (callback) {
+    if (callback === undefined) {
+      return new Promise((resolve, reject) => {
+        this.close((err, data) => {
+          return err ? reject(err) : resolve(data)
+        })
+      })
+    }
+
+    if (typeof callback !== 'function') {
+      throw new InvalidArgumentError('invalid callback')
+    }
+
+    if (this[kDestroyed]) {
+      const err = new ClientDestroyedError()
+      queueMicrotask(() => callback(err, null))
+      return
+    }
+
+    if (this[kClosed]) {
+      if (this[kOnClosed]) {
+        this[kOnClosed].push(callback)
+      } else {
+        queueMicrotask(() => callback(null, null))
+      }
+      return
+    }
+
+    this[kClosed] = true
+    this[kOnClosed] ??= []
+    this[kOnClosed].push(callback)
+
+    const onClosed = () => {
+      const callbacks = this[kOnClosed]
+      this[kOnClosed] = null
+      for (let i = 0; i < callbacks.length; i++) {
+        callbacks[i](null, null)
+      }
+    }
+
+    // Should not error.
+    this[kClose]()
+      .then(() => this.destroy())
+      .then(() => queueMicrotask(onClosed))
+  }
+
+  destroy (err, callback) {
+    if (typeof err === 'function') {
+      callback = err
+      err = null
+    }
+
+    if (callback === undefined) {
+      return new Promise((resolve, reject) => {
+        this.destroy(err, (err, data) => {
+          return err ? reject(err) : resolve(data)
+        })
+      })
+    }
+
+    if (typeof callback !== 'function') {
+      throw new InvalidArgumentError('invalid callback')
+    }
+
+    if (this[kDestroyed]) {
+      if (this[kOnDestroyed]) {
+        this[kOnDestroyed].push(callback)
+      } else {
+        queueMicrotask(() => callback(null, null))
+      }
+      return
+    }
+
+    if (!err) {
+      err = new ClientDestroyedError()
+    }
+
+    this[kDestroyed] = true
+    this[kOnDestroyed] ??= []
+    this[kOnDestroyed].push(callback)
+
+    const onDestroyed = () => {
+      const callbacks = this[kOnDestroyed]
+      this[kOnDestroyed] = null
+      for (let i = 0; i < callbacks.length; i++) {
+        callbacks[i](null, null)
+      }
+    }
+
+    // Should not error.
+    this[kDestroy](err)
+      .then(() => queueMicrotask(onDestroyed))
+  }
+
+  dispatch (opts, handler) {
+    if (!handler || typeof handler !== 'object') {
+      throw new InvalidArgumentError('handler must be an object')
+    }
+
+    handler = UnwrapHandler.unwrap(handler)
+
+    try {
+      if (!opts || typeof opts !== 'object') {
+        throw new InvalidArgumentError('opts must be an object.')
+      }
+
+      if (this[kDestroyed] || this[kOnDestroyed]) {
+        throw new ClientDestroyedError()
+      }
+
+      if (this[kClosed]) {
+        throw new ClientClosedError()
+      }
+
+      return this[kDispatch](opts, handler)
+    } catch (err) {
+      if (typeof handler.onError !== 'function') {
+        throw err
+      }
+
+      handler.onError(err)
+
+      return false
+    }
+  }
+}
+
+module.exports = DispatcherBase
diff --git a/vanilla/node_modules/undici/lib/dispatcher/dispatcher.js b/vanilla/node_modules/undici/lib/dispatcher/dispatcher.js
new file mode 100644
index 0000000..824dfb6
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/dispatcher.js
@@ -0,0 +1,48 @@
+'use strict'
+const EventEmitter = require('node:events')
+const WrapHandler = require('../handler/wrap-handler')
+
+const wrapInterceptor = (dispatch) => (opts, handler) => dispatch(opts, WrapHandler.wrap(handler))
+
+class Dispatcher extends EventEmitter {
+  dispatch () {
+    throw new Error('not implemented')
+  }
+
+  close () {
+    throw new Error('not implemented')
+  }
+
+  destroy () {
+    throw new Error('not implemented')
+  }
+
+  compose (...args) {
+    // So we handle [interceptor1, interceptor2] or interceptor1, interceptor2, ...
+    const interceptors = Array.isArray(args[0]) ? args[0] : args
+    let dispatch = this.dispatch.bind(this)
+
+    for (const interceptor of interceptors) {
+      if (interceptor == null) {
+        continue
+      }
+
+      if (typeof interceptor !== 'function') {
+        throw new TypeError(`invalid interceptor, expected function received ${typeof interceptor}`)
+      }
+
+      dispatch = interceptor(dispatch)
+      dispatch = wrapInterceptor(dispatch)
+
+      if (dispatch == null || typeof dispatch !== 'function' || dispatch.length !== 2) {
+        throw new TypeError('invalid interceptor')
+      }
+    }
+
+    return new Proxy(this, {
+      get: (target, key) => key === 'dispatch' ? dispatch : target[key]
+    })
+  }
+}
+
+module.exports = Dispatcher
diff --git a/vanilla/node_modules/undici/lib/dispatcher/env-http-proxy-agent.js b/vanilla/node_modules/undici/lib/dispatcher/env-http-proxy-agent.js
new file mode 100644
index 0000000..f88437f
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/env-http-proxy-agent.js
@@ -0,0 +1,146 @@
+'use strict'
+
+const DispatcherBase = require('./dispatcher-base')
+const { kClose, kDestroy, kClosed, kDestroyed, kDispatch, kNoProxyAgent, kHttpProxyAgent, kHttpsProxyAgent } = require('../core/symbols')
+const ProxyAgent = require('./proxy-agent')
+const Agent = require('./agent')
+
+const DEFAULT_PORTS = {
+  'http:': 80,
+  'https:': 443
+}
+
+class EnvHttpProxyAgent extends DispatcherBase {
+  #noProxyValue = null
+  #noProxyEntries = null
+  #opts = null
+
+  constructor (opts = {}) {
+    super()
+    this.#opts = opts
+
+    const { httpProxy, httpsProxy, noProxy, ...agentOpts } = opts
+
+    this[kNoProxyAgent] = new Agent(agentOpts)
+
+    const HTTP_PROXY = httpProxy ?? process.env.http_proxy ?? process.env.HTTP_PROXY
+    if (HTTP_PROXY) {
+      this[kHttpProxyAgent] = new ProxyAgent({ ...agentOpts, uri: HTTP_PROXY })
+    } else {
+      this[kHttpProxyAgent] = this[kNoProxyAgent]
+    }
+
+    const HTTPS_PROXY = httpsProxy ?? process.env.https_proxy ?? process.env.HTTPS_PROXY
+    if (HTTPS_PROXY) {
+      this[kHttpsProxyAgent] = new ProxyAgent({ ...agentOpts, uri: HTTPS_PROXY })
+    } else {
+      this[kHttpsProxyAgent] = this[kHttpProxyAgent]
+    }
+
+    this.#parseNoProxy()
+  }
+
+  [kDispatch] (opts, handler) {
+    const url = new URL(opts.origin)
+    const agent = this.#getProxyAgentForUrl(url)
+    return agent.dispatch(opts, handler)
+  }
+
+  [kClose] () {
+    return Promise.all([
+      this[kNoProxyAgent].close(),
+      !this[kHttpProxyAgent][kClosed] && this[kHttpProxyAgent].close(),
+      !this[kHttpsProxyAgent][kClosed] && this[kHttpsProxyAgent].close()
+    ])
+  }
+
+  [kDestroy] (err) {
+    return Promise.all([
+      this[kNoProxyAgent].destroy(err),
+      !this[kHttpProxyAgent][kDestroyed] && this[kHttpProxyAgent].destroy(err),
+      !this[kHttpsProxyAgent][kDestroyed] && this[kHttpsProxyAgent].destroy(err)
+    ])
+  }
+
+  #getProxyAgentForUrl (url) {
+    let { protocol, host: hostname, port } = url
+
+    // Stripping ports in this way instead of using parsedUrl.hostname to make
+    // sure that the brackets around IPv6 addresses are kept.
+    hostname = hostname.replace(/:\d*$/, '').toLowerCase()
+    port = Number.parseInt(port, 10) || DEFAULT_PORTS[protocol] || 0
+    if (!this.#shouldProxy(hostname, port)) {
+      return this[kNoProxyAgent]
+    }
+    if (protocol === 'https:') {
+      return this[kHttpsProxyAgent]
+    }
+    return this[kHttpProxyAgent]
+  }
+
+  #shouldProxy (hostname, port) {
+    if (this.#noProxyChanged) {
+      this.#parseNoProxy()
+    }
+
+    if (this.#noProxyEntries.length === 0) {
+      return true // Always proxy if NO_PROXY is not set or empty.
+    }
+    if (this.#noProxyValue === '*') {
+      return false // Never proxy if wildcard is set.
+    }
+
+    for (let i = 0; i < this.#noProxyEntries.length; i++) {
+      const entry = this.#noProxyEntries[i]
+      if (entry.port && entry.port !== port) {
+        continue // Skip if ports don't match.
+      }
+      // Don't proxy if the hostname is equal with the no_proxy host.
+      if (hostname === entry.hostname) {
+        return false
+      }
+      // Don't proxy if the hostname is the subdomain of the no_proxy host.
+      // Reference - https://github.com/denoland/deno/blob/6fbce91e40cc07fc6da74068e5cc56fdd40f7b4c/ext/fetch/proxy.rs#L485
+      if (hostname.slice(-(entry.hostname.length + 1)) === `.${entry.hostname}`) {
+        return false
+      }
+    }
+
+    return true
+  }
+
+  #parseNoProxy () {
+    const noProxyValue = this.#opts.noProxy ?? this.#noProxyEnv
+    const noProxySplit = noProxyValue.split(/[,\s]/)
+    const noProxyEntries = []
+
+    for (let i = 0; i < noProxySplit.length; i++) {
+      const entry = noProxySplit[i]
+      if (!entry) {
+        continue
+      }
+      const parsed = entry.match(/^(.+):(\d+)$/)
+      noProxyEntries.push({
+        // strip leading dot or asterisk with dot
+        hostname: (parsed ? parsed[1] : entry).replace(/^\*?\./, '').toLowerCase(),
+        port: parsed ? Number.parseInt(parsed[2], 10) : 0
+      })
+    }
+
+    this.#noProxyValue = noProxyValue
+    this.#noProxyEntries = noProxyEntries
+  }
+
+  get #noProxyChanged () {
+    if (this.#opts.noProxy !== undefined) {
+      return false
+    }
+    return this.#noProxyValue !== this.#noProxyEnv
+  }
+
+  get #noProxyEnv () {
+    return process.env.no_proxy ?? process.env.NO_PROXY ?? ''
+  }
+}
+
+module.exports = EnvHttpProxyAgent
diff --git a/vanilla/node_modules/undici/lib/dispatcher/fixed-queue.js b/vanilla/node_modules/undici/lib/dispatcher/fixed-queue.js
new file mode 100644
index 0000000..f918849
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/fixed-queue.js
@@ -0,0 +1,135 @@
+'use strict'
+
+// Extracted from node/lib/internal/fixed_queue.js
+
+// Currently optimal queue size, tested on V8 6.0 - 6.6. Must be power of two.
+const kSize = 2048
+const kMask = kSize - 1
+
+// The FixedQueue is implemented as a singly-linked list of fixed-size
+// circular buffers. It looks something like this:
+//
+//  head                                                       tail
+//    |                                                          |
+//    v                                                          v
+// +-----------+ <-----\       +-----------+ <------\         +-----------+
+// |  [null]   |        \----- |   next    |         \------- |   next    |
+// +-----------+               +-----------+                  +-----------+
+// |   item    | <-- bottom    |   item    | <-- bottom       | undefined |
+// |   item    |               |   item    |                  | undefined |
+// |   item    |               |   item    |                  | undefined |
+// |   item    |               |   item    |                  | undefined |
+// |   item    |               |   item    |       bottom --> |   item    |
+// |   item    |               |   item    |                  |   item    |
+// |    ...    |               |    ...    |                  |    ...    |
+// |   item    |               |   item    |                  |   item    |
+// |   item    |               |   item    |                  |   item    |
+// | undefined | <-- top       |   item    |                  |   item    |
+// | undefined |               |   item    |                  |   item    |
+// | undefined |               | undefined | <-- top  top --> | undefined |
+// +-----------+               +-----------+                  +-----------+
+//
+// Or, if there is only one circular buffer, it looks something
+// like either of these:
+//
+//  head   tail                                 head   tail
+//    |     |                                     |     |
+//    v     v                                     v     v
+// +-----------+                               +-----------+
+// |  [null]   |                               |  [null]   |
+// +-----------+                               +-----------+
+// | undefined |                               |   item    |
+// | undefined |                               |   item    |
+// |   item    | <-- bottom            top --> | undefined |
+// |   item    |                               | undefined |
+// | undefined | <-- top            bottom --> |   item    |
+// | undefined |                               |   item    |
+// +-----------+                               +-----------+
+//
+// Adding a value means moving `top` forward by one, removing means
+// moving `bottom` forward by one. After reaching the end, the queue
+// wraps around.
+//
+// When `top === bottom` the current queue is empty and when
+// `top + 1 === bottom` it's full. This wastes a single space of storage
+// but allows much quicker checks.
+
+/**
+ * @type {FixedCircularBuffer}
+ * @template T
+ */
+class FixedCircularBuffer {
+  /** @type {number} */
+  bottom = 0
+  /** @type {number} */
+  top = 0
+  /** @type {Array<T|undefined>} */
+  list = new Array(kSize).fill(undefined)
+  /** @type {T|null} */
+  next = null
+
+  /** @returns {boolean} */
+  isEmpty () {
+    return this.top === this.bottom
+  }
+
+  /** @returns {boolean} */
+  isFull () {
+    return ((this.top + 1) & kMask) === this.bottom
+  }
+
+  /**
+   * @param {T} data
+   * @returns {void}
+   */
+  push (data) {
+    this.list[this.top] = data
+    this.top = (this.top + 1) & kMask
+  }
+
+  /** @returns {T|null} */
+  shift () {
+    const nextItem = this.list[this.bottom]
+    if (nextItem === undefined) { return null }
+    this.list[this.bottom] = undefined
+    this.bottom = (this.bottom + 1) & kMask
+    return nextItem
+  }
+}
+
+/**
+ * @template T
+ */
+module.exports = class FixedQueue {
+  constructor () {
+    /** @type {FixedCircularBuffer<T>} */
+    this.head = this.tail = new FixedCircularBuffer()
+  }
+
+  /** @returns {boolean} */
+  isEmpty () {
+    return this.head.isEmpty()
+  }
+
+  /** @param {T} data */
+  push (data) {
+    if (this.head.isFull()) {
+      // Head is full: Creates a new queue, sets the old queue's `.next` to it,
+      // and sets it as the new main queue.
+      this.head = this.head.next = new FixedCircularBuffer()
+    }
+    this.head.push(data)
+  }
+
+  /** @returns {T|null} */
+  shift () {
+    const tail = this.tail
+    const next = tail.shift()
+    if (tail.isEmpty() && tail.next !== null) {
+      // If there is another queue, it forms the new tail.
+      this.tail = tail.next
+      tail.next = null
+    }
+    return next
+  }
+}
diff --git a/vanilla/node_modules/undici/lib/dispatcher/h2c-client.js b/vanilla/node_modules/undici/lib/dispatcher/h2c-client.js
new file mode 100644
index 0000000..bd38522
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/h2c-client.js
@@ -0,0 +1,51 @@
+'use strict'
+
+const { InvalidArgumentError } = require('../core/errors')
+const Client = require('./client')
+
+class H2CClient extends Client {
+  constructor (origin, clientOpts) {
+    if (typeof origin === 'string') {
+      origin = new URL(origin)
+    }
+
+    if (origin.protocol !== 'http:') {
+      throw new InvalidArgumentError(
+        'h2c-client: Only h2c protocol is supported'
+      )
+    }
+
+    const { connect, maxConcurrentStreams, pipelining, ...opts } =
+            clientOpts ?? {}
+    let defaultMaxConcurrentStreams = 100
+    let defaultPipelining = 100
+
+    if (
+      maxConcurrentStreams != null &&
+            Number.isInteger(maxConcurrentStreams) &&
+            maxConcurrentStreams > 0
+    ) {
+      defaultMaxConcurrentStreams = maxConcurrentStreams
+    }
+
+    if (pipelining != null && Number.isInteger(pipelining) && pipelining > 0) {
+      defaultPipelining = pipelining
+    }
+
+    if (defaultPipelining > defaultMaxConcurrentStreams) {
+      throw new InvalidArgumentError(
+        'h2c-client: pipelining cannot be greater than maxConcurrentStreams'
+      )
+    }
+
+    super(origin, {
+      ...opts,
+      maxConcurrentStreams: defaultMaxConcurrentStreams,
+      pipelining: defaultPipelining,
+      allowH2: true,
+      useH2c: true
+    })
+  }
+}
+
+module.exports = H2CClient
diff --git a/vanilla/node_modules/undici/lib/dispatcher/pool-base.js b/vanilla/node_modules/undici/lib/dispatcher/pool-base.js
new file mode 100644
index 0000000..6c1f238
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/pool-base.js
@@ -0,0 +1,214 @@
+'use strict'
+
+const { PoolStats } = require('../util/stats.js')
+const DispatcherBase = require('./dispatcher-base')
+const FixedQueue = require('./fixed-queue')
+const { kConnected, kSize, kRunning, kPending, kQueued, kBusy, kFree, kUrl, kClose, kDestroy, kDispatch } = require('../core/symbols')
+
+const kClients = Symbol('clients')
+const kNeedDrain = Symbol('needDrain')
+const kQueue = Symbol('queue')
+const kClosedResolve = Symbol('closed resolve')
+const kOnDrain = Symbol('onDrain')
+const kOnConnect = Symbol('onConnect')
+const kOnDisconnect = Symbol('onDisconnect')
+const kOnConnectionError = Symbol('onConnectionError')
+const kGetDispatcher = Symbol('get dispatcher')
+const kAddClient = Symbol('add client')
+const kRemoveClient = Symbol('remove client')
+
+class PoolBase extends DispatcherBase {
+  [kQueue] = new FixedQueue();
+
+  [kQueued] = 0;
+
+  [kClients] = [];
+
+  [kNeedDrain] = false;
+
+  [kOnDrain] (client, origin, targets) {
+    const queue = this[kQueue]
+
+    let needDrain = false
+
+    while (!needDrain) {
+      const item = queue.shift()
+      if (!item) {
+        break
+      }
+      this[kQueued]--
+      needDrain = !client.dispatch(item.opts, item.handler)
+    }
+
+    client[kNeedDrain] = needDrain
+
+    if (!needDrain && this[kNeedDrain]) {
+      this[kNeedDrain] = false
+      this.emit('drain', origin, [this, ...targets])
+    }
+
+    if (this[kClosedResolve] && queue.isEmpty()) {
+      const closeAll = []
+      for (let i = 0; i < this[kClients].length; i++) {
+        const client = this[kClients][i]
+        if (!client.destroyed) {
+          closeAll.push(client.close())
+        }
+      }
+      return Promise.all(closeAll)
+        .then(this[kClosedResolve])
+    }
+  }
+
+  [kOnConnect] = (origin, targets) => {
+    this.emit('connect', origin, [this, ...targets])
+  };
+
+  [kOnDisconnect] = (origin, targets, err) => {
+    this.emit('disconnect', origin, [this, ...targets], err)
+  };
+
+  [kOnConnectionError] = (origin, targets, err) => {
+    this.emit('connectionError', origin, [this, ...targets], err)
+  }
+
+  get [kBusy] () {
+    return this[kNeedDrain]
+  }
+
+  get [kConnected] () {
+    let ret = 0
+    for (const { [kConnected]: connected } of this[kClients]) {
+      ret += connected
+    }
+    return ret
+  }
+
+  get [kFree] () {
+    let ret = 0
+    for (const { [kConnected]: connected, [kNeedDrain]: needDrain } of this[kClients]) {
+      ret += connected && !needDrain
+    }
+    return ret
+  }
+
+  get [kPending] () {
+    let ret = this[kQueued]
+    for (const { [kPending]: pending } of this[kClients]) {
+      ret += pending
+    }
+    return ret
+  }
+
+  get [kRunning] () {
+    let ret = 0
+    for (const { [kRunning]: running } of this[kClients]) {
+      ret += running
+    }
+    return ret
+  }
+
+  get [kSize] () {
+    let ret = this[kQueued]
+    for (const { [kSize]: size } of this[kClients]) {
+      ret += size
+    }
+    return ret
+  }
+
+  get stats () {
+    return new PoolStats(this)
+  }
+
+  [kClose] () {
+    if (this[kQueue].isEmpty()) {
+      const closeAll = []
+      for (let i = 0; i < this[kClients].length; i++) {
+        const client = this[kClients][i]
+        if (!client.destroyed) {
+          closeAll.push(client.close())
+        }
+      }
+      return Promise.all(closeAll)
+    } else {
+      return new Promise((resolve) => {
+        this[kClosedResolve] = resolve
+      })
+    }
+  }
+
+  [kDestroy] (err) {
+    while (true) {
+      const item = this[kQueue].shift()
+      if (!item) {
+        break
+      }
+      item.handler.onError(err)
+    }
+
+    const destroyAll = new Array(this[kClients].length)
+    for (let i = 0; i < this[kClients].length; i++) {
+      destroyAll[i] = this[kClients][i].destroy(err)
+    }
+    return Promise.all(destroyAll)
+  }
+
+  [kDispatch] (opts, handler) {
+    const dispatcher = this[kGetDispatcher]()
+
+    if (!dispatcher) {
+      this[kNeedDrain] = true
+      this[kQueue].push({ opts, handler })
+      this[kQueued]++
+    } else if (!dispatcher.dispatch(opts, handler)) {
+      dispatcher[kNeedDrain] = true
+      this[kNeedDrain] = !this[kGetDispatcher]()
+    }
+
+    return !this[kNeedDrain]
+  }
+
+  [kAddClient] (client) {
+    client
+      .on('drain', this[kOnDrain].bind(this, client))
+      .on('connect', this[kOnConnect])
+      .on('disconnect', this[kOnDisconnect])
+      .on('connectionError', this[kOnConnectionError])
+
+    this[kClients].push(client)
+
+    if (this[kNeedDrain]) {
+      queueMicrotask(() => {
+        if (this[kNeedDrain]) {
+          this[kOnDrain](client, client[kUrl], [client, this])
+        }
+      })
+    }
+
+    return this
+  }
+
+  [kRemoveClient] (client) {
+    client.close(() => {
+      const idx = this[kClients].indexOf(client)
+      if (idx !== -1) {
+        this[kClients].splice(idx, 1)
+      }
+    })
+
+    this[kNeedDrain] = this[kClients].some(dispatcher => (
+      !dispatcher[kNeedDrain] &&
+      dispatcher.closed !== true &&
+      dispatcher.destroyed !== true
+    ))
+  }
+}
+
+module.exports = {
+  PoolBase,
+  kClients,
+  kNeedDrain,
+  kAddClient,
+  kRemoveClient,
+  kGetDispatcher
+}
diff --git a/vanilla/node_modules/undici/lib/dispatcher/pool.js b/vanilla/node_modules/undici/lib/dispatcher/pool.js
new file mode 100644
index 0000000..77fd532
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/pool.js
@@ -0,0 +1,118 @@
+'use strict'
+
+const {
+  PoolBase,
+  kClients,
+  kNeedDrain,
+  kAddClient,
+  kGetDispatcher,
+  kRemoveClient
+} = require('./pool-base')
+const Client = require('./client')
+const {
+  InvalidArgumentError
+} = require('../core/errors')
+const util = require('../core/util')
+const { kUrl } = require('../core/symbols')
+const buildConnector = require('../core/connect')
+
+const kOptions = Symbol('options')
+const kConnections = Symbol('connections')
+const kFactory = Symbol('factory')
+
+function defaultFactory (origin, opts) {
+  return new Client(origin, opts)
+}
+
+class Pool extends PoolBase {
+  constructor (origin, {
+    connections,
+    factory = defaultFactory,
+    connect,
+    connectTimeout,
+    tls,
+    maxCachedSessions,
+    socketPath,
+    autoSelectFamily,
+    autoSelectFamilyAttemptTimeout,
+    allowH2,
+    clientTtl,
+    ...options
+  } = {}) {
+    if (connections != null && (!Number.isFinite(connections) || connections < 0)) {
+      throw new InvalidArgumentError('invalid connections')
+    }
+
+    if (typeof factory !== 'function') {
+      throw new InvalidArgumentError('factory must be a function.')
+    }
+
+    if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
+      throw new InvalidArgumentError('connect must be a function or an object')
+    }
+
+    if (typeof connect !== 'function') {
+      connect = buildConnector({
+        ...tls,
+        maxCachedSessions,
+        allowH2,
+        socketPath,
+        timeout: connectTimeout,
+        ...(typeof autoSelectFamily === 'boolean' ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
+        ...connect
+      })
+    }
+
+    super()
+
+    this[kConnections] = connections || null
+    this[kUrl] = util.parseOrigin(origin)
+    this[kOptions] = { ...util.deepClone(options), connect, allowH2, clientTtl }
+    this[kOptions].interceptors = options.interceptors
+      ? { ...options.interceptors }
+      : undefined
+    this[kFactory] = factory
+
+    this.on('connect', (origin, targets) => {
+      if (clientTtl != null && clientTtl > 0) {
+        for (const target of targets) {
+          Object.assign(target, { ttl: Date.now() })
+        }
+      }
+    })
+
+    this.on('connectionError', (origin, targets, error) => {
+      // If a connection error occurs, we remove the client from the pool,
+      // and emit a connectionError event. They will not be re-used.
+      // Fixes https://github.com/nodejs/undici/issues/3895
+      for (const target of targets) {
+        // Do not use kRemoveClient here, as it will close the client,
+        // but the client cannot be closed in this state.
+        const idx = this[kClients].indexOf(target)
+        if (idx !== -1) {
+          this[kClients].splice(idx, 1)
+        }
+      }
+    })
+  }
+
+  [kGetDispatcher] () {
+    const clientTtlOption = this[kOptions].clientTtl
+    for (const client of this[kClients]) {
+      // check ttl of client and if it's stale, remove it from the pool
+      if (clientTtlOption != null && clientTtlOption > 0 && client.ttl && ((Date.now() - client.ttl) > clientTtlOption)) {
+        this[kRemoveClient](client)
+      } else if (!client[kNeedDrain]) {
+        return client
+      }
+    }
+
+    if (!this[kConnections] || this[kClients].length < this[kConnections]) {
+      const dispatcher = this[kFactory](this[kUrl], this[kOptions])
+      this[kAddClient](dispatcher)
+      return dispatcher
+    }
+  }
+}
+
+module.exports = Pool
diff --git a/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js b/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js
new file mode 100644
index 0000000..4403b8d
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/proxy-agent.js
@@ -0,0 +1,287 @@
+'use strict'
+
+const { kProxy, kClose, kDestroy, kDispatch } = require('../core/symbols')
+const Agent = require('./agent')
+const Pool = require('./pool')
+const DispatcherBase = require('./dispatcher-base')
+const { InvalidArgumentError, RequestAbortedError, SecureProxyConnectionError } = require('../core/errors')
+const buildConnector = require('../core/connect')
+const Client = require('./client')
+const { channels } = require('../core/diagnostics')
+
+const kAgent = Symbol('proxy agent')
+const kClient = Symbol('proxy client')
+const kProxyHeaders = Symbol('proxy headers')
+const kRequestTls = Symbol('request tls settings')
+const kProxyTls = Symbol('proxy tls settings')
+const kConnectEndpoint = Symbol('connect endpoint function')
+const kTunnelProxy = Symbol('tunnel proxy')
+
+function defaultProtocolPort (protocol) {
+  return protocol === 'https:' ? 443 : 80
+}
+
+function defaultFactory (origin, opts) {
+  return new Pool(origin, opts)
+}
+
+const noop = () => {}
+
+function defaultAgentFactory (origin, opts) {
+  if (opts.connections === 1) {
+    return new Client(origin, opts)
+  }
+  return new Pool(origin, opts)
+}
+
+class Http1ProxyWrapper extends DispatcherBase {
+  #client
+
+  constructor (proxyUrl, { headers = {}, connect, factory }) {
+    if (!proxyUrl) {
+      throw new InvalidArgumentError('Proxy URL is mandatory')
+    }
+
+    super()
+
+    this[kProxyHeaders] = headers
+    if (factory) {
+      this.#client = factory(proxyUrl, { connect })
+    } else {
+      this.#client = new Client(proxyUrl, { connect })
+    }
+  }
+
+  [kDispatch] (opts, handler) {
+    const onHeaders = handler.onHeaders
+    handler.onHeaders = function (statusCode, data, resume) {
+      if (statusCode === 407) {
+        if (typeof handler.onError === 'function') {
+          handler.onError(new InvalidArgumentError('Proxy Authentication Required (407)'))
+        }
+        return
+      }
+      if (onHeaders) onHeaders.call(this, statusCode, data, resume)
+    }
+
+    // Rewrite request as an HTTP1 Proxy request, without tunneling.
+    const {
+      origin,
+      path = '/',
+      headers = {}
+    } = opts
+
+    opts.path = origin + path
+
+    if (!('host' in headers) && !('Host' in headers)) {
+      const { host } = new URL(origin)
+      headers.host = host
+    }
+    opts.headers = { ...this[kProxyHeaders], ...headers }
+
+    return this.#client[kDispatch](opts, handler)
+  }
+
+  [kClose] () {
+    return this.#client.close()
+  }
+
+  [kDestroy] (err) {
+    return this.#client.destroy(err)
+  }
+}
+
+class ProxyAgent extends DispatcherBase {
+  constructor (opts) {
+    if (!opts || (typeof opts === 'object' && !(opts instanceof URL) && !opts.uri)) {
+      throw new InvalidArgumentError('Proxy uri is mandatory')
+    }
+
+    const { clientFactory = defaultFactory } = opts
+    if (typeof clientFactory !== 'function') {
+      throw new InvalidArgumentError('Proxy opts.clientFactory must be a function.')
+    }
+
+    const { proxyTunnel = true } = opts
+
+    super()
+
+    const url = this.#getUrl(opts)
+    const { href, origin, port, protocol, username, password, hostname: proxyHostname } = url
+
+    this[kProxy] = { uri: href, protocol }
+    this[kRequestTls] = opts.requestTls
+    this[kProxyTls] = opts.proxyTls
+    this[kProxyHeaders] = opts.headers || {}
+    this[kTunnelProxy] = proxyTunnel
+
+    if (opts.auth && opts.token) {
+      throw new InvalidArgumentError('opts.auth cannot be used in combination with opts.token')
+    } else if (opts.auth) {
+      /* @deprecated in favour of opts.token */
+      this[kProxyHeaders]['proxy-authorization'] = `Basic ${opts.auth}`
+    } else if (opts.token) {
+      this[kProxyHeaders]['proxy-authorization'] = opts.token
+    } else if (username && password) {
+      this[kProxyHeaders]['proxy-authorization'] = `Basic ${Buffer.from(`${decodeURIComponent(username)}:${decodeURIComponent(password)}`).toString('base64')}`
+    }
+
+    const connect = buildConnector({ ...opts.proxyTls })
+    this[kConnectEndpoint] = buildConnector({ ...opts.requestTls })
+
+    const agentFactory = opts.factory || defaultAgentFactory
+    const factory = (origin, options) => {
+      const { protocol } = new URL(origin)
+      if (!this[kTunnelProxy] && protocol === 'http:' && this[kProxy].protocol === 'http:') {
+        return new Http1ProxyWrapper(this[kProxy].uri, {
+          headers: this[kProxyHeaders],
+          connect,
+          factory: agentFactory
+        })
+      }
+      return agentFactory(origin, options)
+    }
+    this[kClient] = clientFactory(url, { connect })
+    this[kAgent] = new Agent({
+      ...opts,
+      factory,
+      connect: async (opts, callback) => {
+        let requestedPath = opts.host
+        if (!opts.port) {
+          requestedPath += `:${defaultProtocolPort(opts.protocol)}`
+        }
+        try {
+          const connectParams = {
+            origin,
+            port,
+            path: requestedPath,
+            signal: opts.signal,
+            headers: {
+              ...this[kProxyHeaders],
+              host: opts.host,
+              ...(opts.connections == null || opts.connections > 0 ? { 'proxy-connection': 'keep-alive' } : {})
+            },
+            servername: this[kProxyTls]?.servername || proxyHostname
+          }
+          const { socket, statusCode } = await this[kClient].connect(connectParams)
+          if (statusCode !== 200) {
+            socket.on('error', noop).destroy()
+            callback(new RequestAbortedError(`Proxy response (${statusCode}) !== 200 when HTTP Tunneling`))
+            return
+          }
+
+          if (channels.proxyConnected.hasSubscribers) {
+            channels.proxyConnected.publish({
+              socket,
+              connectParams
+            })
+          }
+
+          if (opts.protocol !== 'https:') {
+            callback(null, socket)
+            return
+          }
+          let servername
+          if (this[kRequestTls]) {
+            servername = this[kRequestTls].servername
+          } else {
+            servername = opts.servername
+          }
+          this[kConnectEndpoint]({ ...opts, servername, httpSocket: socket }, callback)
+        } catch (err) {
+          if (err.code === 'ERR_TLS_CERT_ALTNAME_INVALID') {
+            // Throw a custom error to avoid loop in client.js#connect
+            callback(new SecureProxyConnectionError(err))
+          } else {
+            callback(err)
+          }
+        }
+      }
+    })
+  }
+
+  dispatch (opts, handler) {
+    const headers = buildHeaders(opts.headers)
+    throwIfProxyAuthIsSent(headers)
+
+    if (headers && !('host' in headers) && !('Host' in headers)) {
+      const { host } = new URL(opts.origin)
+      headers.host = host
+    }
+
+    return this[kAgent].dispatch(
+      {
+        ...opts,
+        headers
+      },
+      handler
+    )
+  }
+
+  /**
+   * @param {import('../../types/proxy-agent').ProxyAgent.Options | string | URL} opts
+   * @returns {URL}
+   */
+  #getUrl (opts) {
+    if (typeof opts === 'string') {
+      return new URL(opts)
+    } else if (opts instanceof URL) {
+      return opts
+    } else {
+      return new URL(opts.uri)
+    }
+  }
+
+  [kClose] () {
+    return Promise.all([
+      this[kAgent].close(),
+      this[kClient].close()
+    ])
+  }
+
+  [kDestroy] () {
+    return Promise.all([
+      this[kAgent].destroy(),
+      this[kClient].destroy()
+    ])
+  }
+}
+
+/**
+ * @param {string[] | Record<string, string>} headers
+ * @returns {Record<string, string>}
+ */
+function buildHeaders (headers) {
+  // When using undici.fetch, the headers list is stored
+  // as an array.
+  if (Array.isArray(headers)) {
+    /** @type {Record<string, string>} */
+    const headersPair = {}
+
+    for (let i = 0; i < headers.length; i += 2) {
+      headersPair[headers[i]] = headers[i + 1]
+    }
+
+    return headersPair
+  }
+
+  return headers
+}
+
+/**
+ * @param {Record<string, string>} headers
+ *
+ * Previous versions of ProxyAgent suggests the Proxy-Authorization in request headers
+ * Nevertheless, it was changed and to avoid a security vulnerability by end users
+ * this check was created.
+ * It should be removed in the next major version for performance reasons
+ */
+function throwIfProxyAuthIsSent (headers) {
+  const existProxyAuth = headers && Object.keys(headers)
+    .find((key) => key.toLowerCase() === 'proxy-authorization')
+  if (existProxyAuth) {
+    throw new InvalidArgumentError('Proxy-Authorization should be sent in ProxyAgent constructor')
+  }
+}
+
+module.exports = ProxyAgent
diff --git a/vanilla/node_modules/undici/lib/dispatcher/retry-agent.js b/vanilla/node_modules/undici/lib/dispatcher/retry-agent.js
new file mode 100644
index 0000000..0c2120d
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/retry-agent.js
@@ -0,0 +1,35 @@
+'use strict'
+
+const Dispatcher = require('./dispatcher')
+const RetryHandler = require('../handler/retry-handler')
+
+class RetryAgent extends Dispatcher {
+  #agent = null
+  #options = null
+  constructor (agent, options = {}) {
+    super(options)
+    this.#agent = agent
+    this.#options = options
+  }
+
+  dispatch (opts, handler) {
+    const retry = new RetryHandler({
+      ...opts,
+      retryOptions: this.#options
+    }, {
+      dispatch: this.#agent.dispatch.bind(this.#agent),
+      handler
+    })
+    return this.#agent.dispatch(opts, retry)
+  }
+
+  close () {
+    return this.#agent.close()
+  }
+
+  destroy () {
+    return this.#agent.destroy()
+  }
+}
+
+module.exports = RetryAgent
diff --git a/vanilla/node_modules/undici/lib/dispatcher/round-robin-pool.js b/vanilla/node_modules/undici/lib/dispatcher/round-robin-pool.js
new file mode 100644
index 0000000..b113aa9
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/dispatcher/round-robin-pool.js
@@ -0,0 +1,137 @@
+'use strict'
+
+const {
+  PoolBase,
+  kClients,
+  kNeedDrain,
+  kAddClient,
+  kGetDispatcher,
+  kRemoveClient
+} = require('./pool-base')
+const Client = require('./client')
+const {
+  InvalidArgumentError
+} = require('../core/errors')
+const util = require('../core/util')
+const { kUrl } = require('../core/symbols')
+const buildConnector = require('../core/connect')
+
+const kOptions = Symbol('options')
+const kConnections = Symbol('connections')
+const kFactory = Symbol('factory')
+const kIndex = Symbol('index')
+
+function defaultFactory (origin, opts) {
+  return new Client(origin, opts)
+}
+
+class RoundRobinPool extends PoolBase {
+  constructor (origin, {
+    connections,
+    factory = defaultFactory,
+    connect,
+    connectTimeout,
+    tls,
+    maxCachedSessions,
+    socketPath,
+    autoSelectFamily,
+    autoSelectFamilyAttemptTimeout,
+    allowH2,
+    clientTtl,
+    ...options
+  } = {}) {
+    if (connections != null && (!Number.isFinite(connections) || connections < 0)) {
+      throw new InvalidArgumentError('invalid connections')
+    }
+
+    if (typeof factory !== 'function') {
+      throw new InvalidArgumentError('factory must be a function.')
+    }
+
+    if (connect != null && typeof connect !== 'function' && typeof connect !== 'object') {
+      throw new InvalidArgumentError('connect must be a function or an object')
+    }
+
+    if (typeof connect !== 'function') {
+      connect = buildConnector({
+        ...tls,
+        maxCachedSessions,
+        allowH2,
+        socketPath,
+        timeout: connectTimeout,
+        ...(typeof autoSelectFamily === 'boolean' ? { autoSelectFamily, autoSelectFamilyAttemptTimeout } : undefined),
+        ...connect
+      })
+    }
+
+    super()
+
+    this[kConnections] = connections || null
+    this[kUrl] = util.parseOrigin(origin)
+    this[kOptions] = { ...util.deepClone(options), connect, allowH2, clientTtl }
+    this[kOptions].interceptors = options.interceptors
+      ? { ...options.interceptors }
+      : undefined
+    this[kFactory] = factory
+    this[kIndex] = -1
+
+    this.on('connect', (origin, targets) => {
+      if (clientTtl != null && clientTtl > 0) {
+        for (const target of targets) {
+          Object.assign(target, { ttl: Date.now() })
+        }
+      }
+    })
+
+    this.on('connectionError', (origin, targets, error) => {
+      for (const target of targets) {
+        const idx = this[kClients].indexOf(target)
+        if (idx !== -1) {
+          this[kClients].splice(idx, 1)
+        }
+      }
+    })
+  }
+
+  [kGetDispatcher] () {
+    const clientTtlOption = this[kOptions].clientTtl
+    const clientsLength = this[kClients].length
+
+    // If we have no clients yet, create one
+    if (clientsLength === 0) {
+      const dispatcher = this[kFactory](this[kUrl], this[kOptions])
+      this[kAddClient](dispatcher)
+      return dispatcher
+    }
+
+    // Round-robin through existing clients
+    let checked = 0
+    while (checked < clientsLength) {
+      this[kIndex] = (this[kIndex] + 1) % clientsLength
+      const client = this[kClients][this[kIndex]]
+
+      // Check if client is stale (TTL expired)
+      if (clientTtlOption != null && clientTtlOption > 0 && client.ttl && ((Date.now() - client.ttl) > clientTtlOption)) {
+        this[kRemoveClient](client)
+        checked++
+        continue
+      }
+
+      // Return client if it's not draining
+      if (!client[kNeedDrain]) {
+        return client
+      }
+
+      checked++
+    }
+
+    // All clients are busy, create a new one if we haven't reached the limit
+    if (!this[kConnections] || clientsLength < this[kConnections]) {
+      const dispatcher = this[kFactory](this[kUrl], this[kOptions])
+      this[kAddClient](dispatcher)
+      return dispatcher
+    }
+  }
+}
+
+module.exports = RoundRobinPool