Anthony Accioly
1w ago
GM folks. Quick question for folks who understand HTTP caching on reverse proxies like Squid or Cloudflare. If I have a GET REST endpoint responding with 200 OK and the following headers:
Cache-Control: public, max-age=3600
ETag: "123-a"
The proxy should cache and serve the response without hitting the underlying server more than once for the first hour, then send a request with If-Match: "123-a" when the cache goes stale, right? Is there any reason why it wouldn’t?
#gm #asknostr #devstr #http #caching #etag #rest #tech
Cache-Control: public, max-age=3600
ETag: "123-a"
The proxy should cache and serve the response without hitting the underlying server more than once for the first hour, then send a request with If-Match: "123-a" when the cache goes stale, right? Is there any reason why it wouldn’t?
#gm #asknostr #devstr #http #caching #etag #rest #tech
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Replies
Girino Vey!
@Girino Vey!
1w ago
cloudflare usually ignore the headers you set and uses it's own criteria for stale caches. Squid should follow them by default (but i haven't used squid in like 100 years)
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Anthony Accioly
@Anthony Accioly
1w ago
Thank you. Yes, I'm struggling to optimise things with Cloudflare. Some Nostr clients are fetching the same endpoints over and over again (think NIP-05 and Blossom endpoints). When I look at the client code it's usually pretty standard JavaScript fetch request with cache: "default". This should all be hitting the cache, so I really don't understand why I'm getting so many requests.
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Girino Vey!
@Girino Vey!
1w ago
is it really fetching (GET/POST) or just checking for changes (HEAD request, usually with 304 return code)?
Cloudflare does a lot of HEADrequests to check for changes.
Cloudflare does a lot of HEADrequests to check for changes.
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Anthony Accioly
@Anthony Accioly
1w ago
The client code is basically only issuing GET requests (clients should be doing a better job of conforming to HTTP standards for CORS, caching, etc., but this is another conversation). I haven't checked if Khatru answers HEAD requests at the moment. I know that I've added support for OPTIONS due to CORS preflight requests. I'll double-check it in case Cloudflare is trying to do some magic in the background, despite the fact that I'm not seeing related HEAD requests in my Nginx logs.
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