shripadk/sockjs-node — comment on commit b89c5fdf3ddceed63498e54fe3a9e81c832e6e4b
File: src/trans-websocket.coffee line 59
By shripadk:

This was not required as we are performing setUp/tearDown in the `GenericReceiver` class anyways. This would have caused 4 listeners to be added instead of 2.