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Rewrites the image proxy handler to address several issues:
- Stream responses with io.Copy instead of buffering entire image in memory
- Add 25MB size limit via io.LimitReader to prevent memory exhaustion
- Close resp.Body (was previously leaked on every request)
- Validate Content-Type is an image, rejecting HTML/JS/etc
- Forward Content-Type and Content-Length from upstream
- Use http.NewRequestWithContext to propagate client cancellation
- Check upstream status codes, returning 502 for non-2xx
- Fix ETag: use proper quoted format, remove bogus Etag request header check
- Increase timeout from 5s to 30s for slow image servers
- Use proper HTTP status codes (400 for bad input, 502 for upstream errors)
- Add Cache-Control max-age directive alongside Expires header
Tests: comprehensive coverage for Content-Type filtering, upstream errors,
streaming, ETag validation, User-Agent forwarding, and Content-Length.
Benchmarks: cache hit path and streaming at 1KB/64KB/1MB/5MB sizes.
https://claude.ai/code/session_01CZcDDVmF6wNs2YjdhvCppy
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Go benchmarks cover item CRUD/filter/sanitization, API endpoints (stream,
item update, feed list), middleware stack (gzip, security headers, CSRF),
and crawler pipeline (feed parsing, mocked crawl). Stress tests verify
concurrent reads/writes and large dataset handling. Frontend perf tests
measure template generation, DOM insertion, and store event throughput.
New Makefile targets: bench, bench-short, stress, test-perf.
https://claude.ai/code/session_01ChDVWFDrQoFjMYHpaLGr9s
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