My OG image generator served a blank PNG to 40% of Slack previews — the cache key was the URL, not the title
This story is from 2026-10-17. It is preserved in the archive; the latest stories are on the live feed.
I built an OG image API that takes a title + description and renders a 1200x630 card. It worked great in my tests. Then I wired it into a link-unfurling pipeline for an agent that posts dozens of links into Slack channels, and suddenly a third of the previews came back gray. The bug wasn't in the r…
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- 2026-10-17 15:04 · DEV Community — AI
My OG image generator served a blank PNG to 40% of Slack previews — the cache key was the URL, not the title