express-typescript-boilerplate | Boilerplate for creating express server using typescript | REST library

I'm feeling really stupid about that, but here's my problem.

I'm using Socket-Controller and routing-controller in the same NodeTS App. Therefore i needed to create two express servers. One is listening to port 3000 or whatever the env is, and the other on port 65080. Locally, this works perfect. Now on GAE, my HTTP Server for the normal requests is working, while my SocketServer always times out.

If it helps, here is my app.yaml:

I have a nodejs express Rest API and I want to add websocket support. I'm using this boilerplate for the api part and added this library and socket.io to use websockets in the same project (I'm not sure if it matters).

My websockets work as expected without the Rest API but as soon as I make an http request to my API, connections to the websocket fail with the following error:

WebSocket connection to 'ws://localhost:3000/socket.io/?EIO=3&transport=websocket' failed: Invalid frame header

Already established connections still work though. This problem remains until I restart my server.

I found a lot of different possible causes for this error but none of which really helped me.

Edit: This is how I connect to the websockets.

I am stuck some silly problem (not sure about this).

I am using Express with Typescript for my API creation.

My problem is as follows:

I have 1 endpoint called Offers, and On that I am doing some operations like findBy Status etc along with CRUD operations, my controller is as follows: