Nginx Conditional Upstream

upstream p1 {
  server foo.com;
}


upstream p2 {
  server bar.com;
}

# Select upstream based on the value of query parameter `product`
map $arg_product $profile{
  default "p1";
  foo "p1";
  bar "p2";
}


server {
  location /foobar {
    proxy_pass http://$profile;
  }
}