if ($request_method = 'OPTIONS') {
    include /etc/nginx/conf.d/include/cors-headers;
    more_set_headers 'Access-Control-Max-Age: 1728000';
    more_set_headers 'Content-Type: text/plain; charset=utf-8';
    more_set_headers 'Content-Length: 0';
    return 204;
}

include /etc/nginx/conf.d/include/cors-headers;