Nginx purge request support without modifying URI

For those of you looking to properly support PURGE requests in NGINX without listening on a separate port or mucking with the uri. I saw a couple of support requests for munging the $request_uri with /purge and the like. This is problematic (as the issues suggest) so I played around with this for a bit.

Try this out:

location / {
   error_page 477 = @purge;
   if ($request_method = PURGE) { 
      return 477;
   }
    
    add_header X-Cache-Status $upstream_cache_status;
    proxy_cache mycache;

   proxy_cache_key "$host$request_uri";  //important!
   // Skipping all implementation options
}


location @purge {
      access_log /var/log/nginx/caching.purge.log;
      proxy_cache_purge mycache $host$request_uri;
}

Being in a seperate location block, you can now assign ACL's without messing with the original cache details.