Switch extraction fetcher to curl_cffi for Cloudflare-fronted sources#20
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Replaces httpx with curl_cffi in bioscancast/extraction/fetcher.py so the fetcher uses a browser TLS fingerprint (Chrome by default) and gets past Cloudflare/JA3 blocks that returned 401 on Reuters and intermittent 403s on CIDRAP during the docling eval. Streaming, 25 MB cap, magic-byte sniffing, and the never-raise contract are preserved. ExtractionConfig.user_agent is replaced with .impersonate; the impersonation profile sets a matching browser UA automatically. A pytest --live flag (registered in a new conftest.py) gates a live integration test against Reuters; suite stays hermetic by default. Closes #18. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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rapsoj
approved these changes
May 18, 2026
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Summary
curl_cffiinbioscancast/extraction/fetcher.pyso HTTP fetches use a browser TLS fingerprint (Chrome by default). This gets past Cloudflare/JA3-based blocks that returned HTTP 401 on Reuters and intermittent 403s on CIDRAP during the docling eval.ExtractionConfig.user_agentis replaced with.impersonate("chrome"default); the impersonation profile sets a matching browser UA automatically.response.close()since the streamingResponsein curl_cffi 0.15.0 isn't a context manager.tests/conftest.pyregisters alivepytest marker and a--liveCLI flag; live integration tests are skipped by default.https://www.reuters.com/to confirm the Cloudflare path actually works end-to-end.pytest --liveopt-in.Closes #18.
Test plan
pytest bioscancast/tests/— 179 passed, 1 skipped (live)pytest bioscancast/tests/test_extraction_fetcher.py --live— 15 passed (Reuters returns 200 + HTML, confirming the Cloudflare bypass)ExtractionConfig.user_agent(grep confirms only the newimpersonatefield is referenced)🤖 Generated with Claude Code