Nginx Route Requests by Parameters

In nginx, you can use if statements to forward requests based on parameters. Here is an example configuration:

server {
    listen 80;
    server_name example.com;

    location / {
        if ($arg_param1 = "value1") {
            proxy_pass http://backend1;
        }

        if ($arg_param2 = "value2") {
            proxy_pass http://backend2;
        }

        proxy_pass http://default_backend;
    }

    upstream backend1 {
        server backend1.example.com;
    }

    upstream backend2 {
        server backend2.example.com;
    }

    upstream default_backend {
        server default_backend.example.com;
    }
}

In the example above, if the value of parameter param1 is value1, nginx will forward the request to backend1; if the value of parameter param2 is value2, it will be forwarded to backend2; otherwise, it will be forwarded to the default_backend. By using if statements, requests can be flexibly forwarded based on the value of the parameters.