Nginx Redirect Websocket

I want to redirect my websocket to another server. As we known, nginx command rewrite or redirect can

do such a kind of http request, however, they do not work to redirect websocket. I was testing them and 

found the solution:

location ~ /ws {
    proxy_pass https://domain;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_buffering off;
    proxy_redirect off;

    proxy_set_header Connection "Upgrade";
    proxy_set_header Host $http_host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Scheme $scheme;
}