Article OG card: JPEG + warm on preview (fix missing WhatsApp image)#640
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WhatsApp showed the article's title/description but no image: the card was a ~530KB PNG (PNG is the wrong format for a photo) rendered cold on first hit (it downloads the article's photo), so the crawler's og:image fetch raced its timeout and it kept the text-only preview. Two fixes: - Serve the article card as JPEG (~75KB, ~7x smaller) — crawlers fetch it fast and don't skip it. Route + og:image are now .jpg / image/jpeg. - Warm the card during the /shared_article_preview HTML request, so og:image is a cache hit the moment the crawler asks for it (the photo download no longer races the image-fetch timeout). The photo is fetched only on a cache miss. Audio cards are unaffected (flat PNG, no remote fetch, instant). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Follow-up to #639. WhatsApp showed the article title/description but not the image: the card was a ~530KB PNG (wrong format for a photo) rendered cold on first hit (downloads the article's photo), so the crawler's og:image fetch raced its timeout → text-only preview.
Audio cards unaffected. Re-test with a fresh article URL (WhatsApp cached the old text-only preview per-URL).
🤖 Generated with Claude Code