4-in-a-row

Online in-browser multiplayer 4 in a row. Backend written in Go. Frontend in JavaScript.
Uses websockets.

Try it here. (might not always be up.)

Can play with 2-6 players, though any more than 2 usually ends in a draw. Grid size customisation could fix this, but I haven't added it.

This is designed to work behind a reverse proxy serving https, if you want to use it standalone or over http then you must change wss:// to ws:// in static/js/c4.js

If used behind a reverse proxy you will get websocket errors unless you add the correct headers for location /ws. Here is my config for nginx:

location /ws {
              proxy_set_header X-Real-IP $remote_addr;
              proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
              proxy_set_header X-Forwarded-Proto $scheme;
              proxy_set_header Host $host;
              proxy_set_header X-NginX-Proxy true;

              proxy_pass http://<ENTER HOST HERE>:8292;
              proxy_redirect off;

              proxy_http_version 1.1;
              proxy_set_header Upgrade $http_upgrade;
              proxy_set_header Connection "upgrade";
    }

Should be easy for apache also.

Docker

To install:

docker run \
-d \
--name connect4 \
-p 8292:8292 \
--restart unless-stopped \
en3wton/connect4

Port 8292 in the container must be published.