HTTP uses GMT [1,2] rather than UTC as timezone for timestamps. However,
the Last-Modified header used UTC which confused at least wget.
Before, UTC was used:
$ wget --no-check-certificate -S --spider https://cb_pages_tests.localhost.mock.directory:4430/images/827679288a.jpg
...
Last-Modified: Sun, 11 Sep 2022 08:37:42 UTC
...
Last-modified header invalid -- time-stamp ignored.
...
After, GMT is used:
$ wget --no-check-certificate -S --spider https://cb_pages_tests.localhost.mock.directory:4430/images/827679288a.jpg
...
Last-Modified: Sun, 11 Sep 2022 08:37:42 GMT
...
(no last-modified-header-invalid warning)
[1]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Last-Modified
[2]: https://www.rfc-editor.org/rfc/rfc9110#name-date-time-formats
Fixes #364
---
Whatt I noticed is that the If-Modified-Since header isn't accepted (neither with GMT nor with UTC):
```
$ wget --header "If-Modified-Since: Sun, 11 Sep 2022 08:37:42 GMT" --no-check-certificate -S --spider https://cb_pages_tests.localhost.mock.directory:4430/images/827679288a.jpg
Spider mode enabled. Check if remote file exists.
--2024-07-15 23:31:41-- https://cb_pages_tests.localhost.mock.directory:4430/images/827679288a.jpg
Resolving cb_pages_tests.localhost.mock.directory (cb_pages_tests.localhost.mock.directory)... 127.0.0.1
Connecting to cb_pages_tests.localhost.mock.directory (cb_pages_tests.localhost.mock.directory)|127.0.0.1|:4430... connected.
WARNING: The certificate of ‘cb_pages_tests.localhost.mock.directory’ is not trusted.
WARNING: The certificate of ‘cb_pages_tests.localhost.mock.directory’ doesn't have a known issuer.
HTTP request sent, awaiting response...
HTTP/1.1 200 OK
Allow: GET, HEAD, OPTIONS
Cache-Control: public, max-age=600
Content-Length: 124635
Content-Type: image/jpeg
Etag: "073af1960852e2a4ef446202c7974768b9881814"
Last-Modified: Sun, 11 Sep 2022 08:37:42 GMT
Referrer-Policy: strict-origin-when-cross-origin
Server: pages-server
Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
Date: Mon, 15 Jul 2024 21:31:42 GMT
Length: 124635 (122K) [image/jpeg]
Remote file exists
```
I would have expected a 304 (Not Modified) rather than a 200 (OK). I assume this is simply not supported and on production 304 is returned by a caching proxy in front of pages-server.
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/365
Reviewed-by: crapStone <codeberg@crapstone.dev>
Co-authored-by: Peter Gerber <peter@arbitrary.ch>
Co-committed-by: Peter Gerber <peter@arbitrary.ch>
bc9111a05f
