WebSocket connection failed: Error during WebSocket handshake: Unexpected response code: 400

Question

I am trying to integrate Socket.io with Angular and I\'m having difficulties making a connection from the client-side to the server. I\'ve looked through other related quest

Answer 1

Using Apollo Server 2.

Per https://github.com/apollographql/apollo-client/issues/4778#issuecomment-509638071, this solved my problem:

try 'ws://localhost:4000/graphql'

...since incoming and outgoing requests now use the same address.