We’re using Cloudflare Workers to serve our static assets. The origin is Google Cloud Storage.
Today, our site went down because our JS bundle continuously returned 503 until we did a rollback which changed the JS bundle. I investigated the incident and noticed that the cache statistics clearly show the errors and that most of the requests were cache hits. My conclusion is that Cloudflare had cached a (temporary) 503 returned by Google Cloud Storage.
Our worker is using “cacheTtl: 31536000” to allow infinite caching because the files are considered immutable. I see that “cacheTtlByStatus” is only available to enterprise customers. Is there a way to still use “cacheTtl” in a safe way? There is always the risk that the origin server returns 503 for whatever reason, which should not poison the cache.