fix(download-ref): drop .pdf suffix from arXiv PDF URLs - #67
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arXiv now answers HTTP 406 Not Acceptable for https://arxiv.org/pdf/<id>.pdf regardless of User-Agent, while the suffix-free https://arxiv.org/pdf/<id> returns the PDF. Both fetch sites in fetch_metadata.py (arXiv manifest entries and DOI entries with an arXiv preprint) used the suffixed form, so every PDF download failed. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Summary
HTTP 406 Not Acceptableforhttps://arxiv.org/pdf/<id>.pdfregardless of User-Agent; the suffix-freehttps://arxiv.org/pdf/<id>still serves the PDF.fetch_metadata.pyused the suffixed form at both fetch sites (arXiv manifest entries, and DOI entries with an arXiv preprint), so every arXiv PDF download failed.Test plan
python3 -cprobe: suffixed URL → 406, suffix-free URL → 200application/pdffetch_metadata.py --download-arxiv-pdfson a 79-paper manifest: 66 PDFs fetched (the rest blocked by a VPN-level 406 unrelated to the URL form)🤖 Generated with Claude Code