Serve a folder for a parameter

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I have a question regarding parameter after root url:

URL is : https://test/?version=12.1.0

What I want there is a parameter starting with version=numner.number.number To serve a folder under the root dir "v12.1.0"

location ~ ^\?version=v(\d+\.\d+\.\d+)  {
     root           /var/www/test/htdocs/v$2;

}

Is that possible? I've been trying wiith try files and root, but I cannot manage to make it work. Should I use map in this situation?

nginx-reverse-proxy nginx-config location nginx parameters
1 Answers

Nginx normalises the URI before processing it. The part of the URI before the ? is available as the $uri variable, and the part of the URI after the ? is available as the $args variable.

The location and rewrite directives operate on the value of the $uri variable, so your present approach will not work, as the query string has already been remove.

The $args variable is further split into other individual variables, so that the value of your version= parameter is available as $arg_version.

One solution is to use a map block to decode $arg_version and use the mapped variable in a try_files statement as required.

For example:

map $arg_version $mypath {
    ~*^(v\d+\.\d+\.\d+)$ $1/;
    default              "";
}

server {
    ...

    root /var/www/test/htdocs;

    location ... {
        try_files $mypath$uri =404;
    }
}

We could use $arg_version as is, but the map ensures that the path prefix is sanitised and contains the necessary / separator.

Note that the map block lives outside of the server block. See this document for details.

Depending on your specific requirements, you could also use the mapped variable directly with root. For example:

root /var/www/test/htdocs/$mypath;
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