websocket connection timeout on heroku nodejs

问题

I use npm express-ws for handling websocket request on my express application. On local it works fine. Somehow when I deploy to heroku, it seems to be there is connection timeout every 1 minute of inactivity (no WebSocket request).

How to resolve this issue on heroku?

来源：https://stackoverflow.com/questions/61966291/websocket-connection-timeout-on-heroku-nodejs