Mastering Nginx

Reverse Proxy Advanced Topics

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The following configuration summarizes the directives used to store these files:

http {

proxy_temp_path /var/www/tmp;

server {

root /var/www/data

location /img {

error_page 404 = @store;

}

location @store {

internal;

proxy_store on;

proxy_store_access group:r all:r;

proxy_pass http://upstream;

}

}

}

In this configuration, we define a server with a root under the same filesystem as

the proxy_temp_path. The location directive /img will inherit this root, serving

files of the same name as the URI path under /var/www/data. If a file is not found
(error code 404), the named location directive @store is called to fetch the file from

the upstream. The proxy_store directive indicates that we want to store files under
the inherited root with permissions 0644 (the user:rw is understood, while group

or all are specified in proxy_store_access). That's all it takes for NGINX to store

a local copy of static files served by the upstream server.