Split clients nginx conf

domain.conf

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log;
pid        /run/nginx.pid;


events {
    worker_connections  1024;
}


http {

    split_clients "${remote_addr}-{$query_string}" $goto {
        50.0%           "http://127.0.0.1:8081";
        *               "http://127.0.0.1:8082";
     }

    server {
        listen 8080;
        return 301 $goto;
    }


    server {
        listen 8081;
        return 200 "server1\n";
    }

    server {
        listen 8082;
        return 200 "server2\n";
    }
}

Test:

$ wget -qO - "127.0.0.1:8080/?a=1234"
server2
$ wget -qO - "127.0.0.1:8080/?a=123"
server1

Thanks for your post.. but I am trying to send 50% traffic to another host but it does not work.. see this config

split_clients "${remote_addr}" $goto {
         50.0%   "http://serverA.domain.com";
         50.0%   "http://serverB.domain.com";
    }

server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  serverA.domain.com;
        root         /usr/share/nginx/html;
        return 200 $goto;


location / {
        proxy_set_header Host $host;
        proxy_pass http://$goto;
        }