Working with Proxies

map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}
server {
  location /ws {
    proxy_pass http://backend;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_buffering off;
    proxy_read_timeout 3600s;
  }
}

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so

<VirtualHost *:443>
  ProxyPass        /ws  ws://backend:8080/ws
  ProxyPassReverse /ws  ws://backend:8080/ws
</VirtualHost>

frontend https
  bind *:443 ssl crt /etc/ssl/site.pem
  acl is_ws hdr(Upgrade) -i websocket
  use_backend ws_back if is_ws
  default_backend http_back

backend ws_back
  balance source
  timeout tunnel 1h
  server ws1 10.0.0.1:8080 check
  server ws2 10.0.0.2:8080 check