renshuu's image server does, among other things, redirecting from png/jpg to webp when supported, as well as on-the-fly resizing of files (different pixel densities for different devices).
It works, but it's skipping a number of steps, causing caching to not work all the time, and the downloads to be a bit slower than they should be. All the issues are inside of nginx.
For nginx, my http block contains this (the formatting is right in the file, but less than ideal in here, sorry!):
map $http_accept $jpg { default ".jpg"; "~image/webp" ".webp"; }
This allows me to rewrite the file extension to the appropriate type
My location block looks like this (heads and log files ignored)
location ~ ^/.*\.jpg.*?$ {
rewrite ^(.+?).jpg(.*)$ $1$jpg last;
}
If the URI is /img/wpics/27105.jpg (one of the vocabulary images),
Expected (after rewrite):
/img/wpieces/27105.webp (if webp is accepted, otherwise no change)
Actual:
.webp
-->In other words, that $1 is not getting the (.+?) value.
However, if I change the rewrite line to the following
rewrite ^(.+?).jpg(.*)$ $1 last;
It will give me /img/wpics/27105 (as expected)
It's almost as if the two variables are somehow interfering with one another.
I've tried variations: $jpg$1, $1&$jpg <-- in all cases, if $jpg is in there, then $1 doesn't output anything. I feel like the map processing is causing issues somehow. Here is the rewrite debug output:
2024/04/04 06:02:34 [notice] 1145540#1145540: *92329376 "^(.+).jpg(.*)$" matches "/img/wpics/27105.jpg", client: xxx.xxx.xx.xx, server: itest.renshuu.org, request: "GET /img/wpics/27105.jpg HTTP/2.0", host: "itest.renshuu.org"
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http map started
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http script var: "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http map: "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7" ".webp"
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http script capture: ""
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http script var: ".webp"
2024/04/04 06:02:34 [debug] 1145540#1145540: *92329376 http script regex end
I feel that somehow, the map is breaking the rewrite flow, but I cannot figure out why.
