Home / server / Questions / 389571
Accepted
anonymous-one
Asked: 2012-05-17 02:50:27 +0800 CST

NGINX Reverse Proxy : proxy_cache inside if block - Possible?

  • 772

I think starting with a small snippet would be wisest:

    location ^~ /test/ {
            proxy_pass              http://frontend;
            proxy_http_version      1.1;
            proxy_set_header        Connection "";
            proxy_set_header        Host $host;
            proxy_set_header        X-Real-IP $remote_addr;
            proxy_set_header        X-Real-Port $server_port;
            if ( $remote_addr ~* "123.123.123.123" ) {
                    proxy_cache            cache_base;
                    proxy_cache_valid      720m;
            }
    }

So, in essence what we want to do is setup proxy caching based on a coniditonal IF statement.

The above does not work, as proxy_cache is not valid inside IF.

Does anyone know how to proxy cache based on a regexp match on one of the many nginx internal variables?

Note:

We want to basically disable / enable proxy_caching based on $remote_addr regexp. Not specify different proxy_cache values.

Thanks.

scripting cache proxy nginx regex

2 Answers

  1. Best Answer

    It seems that what you really want is to combine a geo variable with proxy_cache_bypass and proxy_no_cache:

    geo $skip_cache {
  default 1;
  123.123.123.123/32 0;
  1.2.3.4/32 0;
  10.0.0.0/8 0;
}

server {
  location ^~ /test/ {
    proxy_pass              http://frontend;
    proxy_http_version      1.1;
    proxy_set_header        Connection "";
    proxy_set_header        Host $host;
    proxy_set_header        X-Real-IP $remote_addr;
    proxy_set_header        X-Real-Port $server_port;
    proxy_cache            cache_base;
    proxy_cache_valid      720m;

    # When $skip_cache is 1, the cache will be bypassed, and
    # the response won't be eligible for caching.
    proxy_cache_bypass     $skip_cache;
    proxy_no_cache         $skip_cache;
  }
}
    • 5

  2. 'If' is generally a bad practive in nginx configuration. You can use map module to make things work. see http://nginx.org/en/docs/http/ngx_http_map_module.html http://wiki.nginx.org/HttpMapModule

    map $remote_addr $matched_ip_location { 
123.123.123.123 @cache; 
default         @default; 
} 
... 
location ^~ /test/ {
 ... 
rewrite ^ $matched_ip_location
}
location @cache {
    ...
    proxy_cache            cache_base;
    proxy_cache_valid      720m;
}
location @default {
   ...
}
    • 1