Comment on Suggestion to decrease server bandwidth load

straycatstrut@discuss.tchncs.de ⁨4⁩ ⁨weeks⁩ ago

$ curl -I https://discuss.tchncs.de/pictrs/image/7285a9e0-5492-4461-8188-6778d7d594c7.jpeg

HTTP/2 200 
server: openresty
date: Tue, 02 Dec 2025 12:51:29 GMT
content-type: image/jpeg
access-control-expose-headers: content-type, accept-ranges, transfer-encoding, date, cache-control, last-modified
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers
cache-control: max-age=31536000
last-modified: Mon, 30 Jun 2025 11:02:52 GMT
expires: Wed, 02 Dec 2026 12:51:29 GMT
cache-control: public
access-control-allow-origin: *
x-cache-status: HIT

• straycatstrut@discuss.tchncs.de ⁨4⁩ ⁨weeks⁩ ago

  Firefox webdev console request headers (minus my personal cookie), where I’m already on the page and just click the refresh button. No if-modified-since sent to the server to trigger a proper 304 response:

  GET /pictrs/image/7285a9e0-5492-4461-8188-6778d7d594c7.jpeg?format=webp HTTP/2
  Host: discuss.tchncs.de
  User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.0
  Accept: image/avif,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate, br, zstd
  Referer: https://discuss.tchncs.de/
  Sec-Fetch-Dest: image
  Sec-Fetch-Mode: no-cors
  Sec-Fetch-Site: same-origin
  Connection: keep-alive
  DNT: 1
  Sec-GPC: 1
  Priority: u=5, i
  TE: trailers
  

  source

  • Stefan_S_from_H@discuss.tchncs.de ⁨4⁩ ⁨weeks⁩ ago

    It could be that Firefox doesn’t cache files if the URL has a query parameter.

    source

    • straycatstrut@discuss.tchncs.de ⁨4⁩ ⁨weeks⁩ ago

      Sadly, no - I run an extension called “Don’t accept webp” causing that, I disabled it as soon as I saw the param to test and there’s no difference with or without the param. (webdev console request headers)

      source