How to duplicate a request to 2 servers?

Question

Nginx

There is a location that sends api to php.
Task: you need to make this request sent to 2 servers at once (not balancing, but a double).

location ~ ^/backend/api/event(.*) {
        set $upstream 111.111.111.111:9000;

        rewrite ^/backend/(.*)$ /$1 break;
        fastcgi_pass $upstream;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME /code/web/app.php;
        fastcgi_param REQUEST_URI $uri$is_args$args;
    }

Moreover, for the first server:
fastcgi_param SCRIPT_FILENAME /code/web/app.php;

For the second:

fastcgi_param SCRIPT_FILENAME /var/www/public/index.php;

Answer 1

nginx.org/en/docs/http/ngx_http_mirror_module.html