NGINX

NGINX is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.

Upgrade connection to WebSocket.

proxy_set_header  Upgrade $http_upgrade;
proxy_set_header  Connection "Upgrade";

Keep real client IP address.

proxy_set_header  X-Real-IP $remote_addr;
proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header  X-Forwarded-Host $server_name;

Redirect requests removing the API version.

server {
  ...
  location ~ ^/v1(/.*) {
    ...
    rewrite ^/v1(/.*)$ $1 break;
    ...
  }
}