How does Laravel know the request uri when working behind Nginx?

Question

I'm using Laravel, but I assume it could be any PHP framework (e.g. Symfony).

I have the following Nginx config:

location / {
    try_files $uri $uri/ /index.php$is_args$args;
}

location = /index.php {
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
    include fastcgi_params;
}

I'm making this request and everything works fine:

GET /v3/action/1332899709/some-endpoint?page=1

As far as I understand, nginx transforms this request to just /index.php?page=1. So, why does this work? How does Laravel know what uri have I requested? Does nginx pass some request data "under the hood", while checking endpoints in try_files?

Answer 1

The routing is done with the help of fastcgi_params, such as SCRIPT_FILENAME, REQUEST_URI etc.