Xenforo How do you apply specific limit_req for proxy.php request?

You need to do rate limiting within the php location that serves the proxy.php php file i.e.

Create one specific for the proxy.php location based on default php.conf include file at /usr/local/nginx/conf/xfproxy_php.conf and include that in your proxy.php location context match

Code (Text):

cp -a /usr/local/nginx/conf/php.conf /usr/local/nginx/conf/xfproxy_php.conf

Code (Text):

location ~ ^/proxy.php {
  add_header proxy "1";
  include /usr/local/nginx/conf/xfproxy_php.conf;
  try_files $uri /index.php?$uri&$args;
}

Then rate limit request goes in /usr/local/nginx/conf/xfproxy_php.conf i.e. first 4 lines would be like

Code (Text):

location ~ [^/]\.php(/|$) {
  add_header Proxy-RR "1";
  limit_req zone=xwplogin burst=1 nodelay;
  include /usr/local/nginx/conf/503include-only.conf;

header added to verify that proxy.php file is served via the /usr/local/nginx/conf/xfproxy_php.conf include file and not global default /usr/local/nginx/conf/php.conf

Code (Text):

curl -I http://localhost/proxy.php     
HTTP/1.1 200 OK
Date: Fri, 28 Aug 2020 22:10:33 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
Server: nginx centminmod
X-Powered-By: centminmod
Proxy-RR: 1

of course you can add rate limiting to global /usr/local/nginx/conf/php.conf include file to so every php file request for all sites on Centmin Mod server are rate limited the same too.