NGINX specify variable for specific directory and index file only

Question

I am using fastcgi caching, and would like to specify which URLs the cache should be active on.

I use a rewrite rule to determine which controller file to access, and set any query parameters dynamically

I want to specify URLs in which the cache is activated, and those in which it is inactive, this is my code:

server {
    listen 80;
    server_name domain.com;
    root /home/site/wwwroot;

    set %skip_cache 1;        #this is the variable that I want to set to 0 on specific URLS

    location / {
        try_files $uri $uri/ $uri.html @php;
    }
    location @php {         
        rewrite ^(/[^/]+)$ $1.php last;
        rewrite ^(/[^/]+)/(.*)$ $1.php?q=$2 last;
    }


    location /user/ {
        set $skip_cache 0;
    }

    location /objects/ {
        set $skip_cache 0;
    }

    location ~ \.php$  {
        try_files $uri =404;
        include fastcgi_params;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
        fastcgi_split_path_info ^(.+?\.php)(/.*)?$;
        fastcgi_connect_timeout         300; 
        ...etc...

    #cache parameters
    fastcgi_param FASTCGI_CACHE 1;
    fastcgi_cache cfcache;
    fastcgi_cache_valid 30s;
    fastcgi_cache_bypass $skip_cache;
    fastcgi_no_cache $skip_cache;
    add_header X-FastCGI-Cache $upstream_cache_status;  
}

as you can see, the variable $skip_cache is set to 1 by default, and I would like to white list URLs for caching.

An example I would like cached is domain.com, domain.com/user/123 and domain.com/objects/456

Currently, if I browse to /user/123, the result is a 404 error, as I believe that location block with the variable setting is being used exclusively.

Richard Smith · Accepted Answer · 2019-02-17 22:35:04Z

1

If you want to set a variable based on the original request, you should use a map directive with the $request_uri variable. See this document for details.

For example:

map $request_uri $skip_cache {
    default      1;
    ~^/user/     0;
    ~^/objects/  0;
}
server {
    ...
    fastcgi_cache_bypass $skip_cache;
    fastcgi_no_cache $skip_cache;
    ...
}

answered Feb 17, 2019 at 22:35

Richard Smith

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2 Comments

JimmyBanks Over a year ago

Thank you, that's working great! Do you know how to make it hit the index file as well, so for example domain.com which is rewritten to domain.com/index.php how to get that index file to also be white listed?

Richard Smith Over a year ago

You can add a / 0; line and a ~^/index.php 0; line to the map.

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