Heroku wasn't receiving the request from MT4

[lahfir]

Hello,

Thanks for creating this amazing package. Well for context, I have deployed my flask app on heroku and a normal web request from MT4 is going through and heroku is receiving the request from MT4. But when I switched to using the websocket of yours, the server says this:

The client sent a request that the server couldn't understand (400 bad request)

I tried to debug every single thing received on the endpoint but the log itself is not showing.

Can you help around with this?