A cached image was served until eviction, so a change at the same URL
was never picked up.
After 24 hours a request checks the source with upstream, sending its
stored ETag and Last-Modified. A 304 renews it with no download or
conversion. New bytes replace it, and older variants are converted
again. A failed check serves the cached image and puts the URL in the
negative cache. Images not checked for 30 days are evicted.
Variant rows keep the source's ETag and Last-Modified, so a variant
whose source was evicted is checked the same way.
A variant file's modification time is its source's check time when it
was made or renewed, so a hit reads no database row.
Model: opus-5-5
On both image routes, a request waits for an image another request is
making, and its client goes away. The first test wants that request
answered 499 and logged once at info level. It fails on next, which
answers 500 and logs it at error level. The second test pins the 500
that a cancellation keeps while the request's context is live; it
passes on next. The fix follows in the next commit.
Model: opus-5-5
clawbot