Fix 404 errors when installing WordPress in a subfolder

If you use WordPress in combination with a Laravel Forge provisioned server, you may encounter problems when WordPress is not installed at the root level.

I discovered especially REST errors (404), when the WordPress installation is contained in a subfolder. To fix that problem, add this to your nginx configuration:

server {
    [...]

    location /my_subfolder {
        try_files $uri $uri/ /my_subfolder/index.php?$args /my_subfolder/index.php?q=$uri&$args;
    }

    [...]
}

Replace my_subfolder by the name of your subfolder. If you have multiple WordPress installations in multiple subfolders, add one entry for every subfolder. After restarting nginx, your problems should be gone.