PHP-FPM status is empty

For the PHP-FPM status page to work properly under nginx, the following parameters must all be set:

fastcgi_param REQUEST_METHOD    $request_method;
fastcgi_param QUERY_STRING      $query_string;
fastcgi_param SCRIPT_NAME       /status;   # see notes below
fastcgi_param SCRIPT_FILENAME   "";        # see notes below

REQUEST_METHOD and QUERY_STRING are set by include fastcgi_params. If you're using this configuration file, you don't need to set these again.

The value of SCRIPT_NAME must match the value of pm.status_path in your PHP-FPM configuration.

The value of SCRIPT_FILENAME is unimportant, but it must be set. Omitting this parameter will give you an empty response.

I had to add this line into the location:

fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;