Erlang Cowboy WSS example

I struggled for a while to get a working example with erlang and secure websockets. A lot had to do with not understanding the recommended erlang build chain. Here's a working example of WSS.

Steps

1. git clone https://github.com/DanThiffault/cowboy-wss-example
2. openssl req -x509 -newkey rsa:2048 -keyout priv/ssl/key.pem -out priv/ssl/cert.pem -days 365 -nodes
3. make all
4. make rel
5. ./_rel/bin/websocket_example start
6. visit http://localhost:8080 or https://localhost:8443

If you're using https, make sure to change the connection to wss://localhost:8443

Debugging

tail -F _rel/log/*

Useful links

• Erlang.mk
• Relx release creation
• Explanation of Erlang.mk & Relx

Explanation