Connecting to server results in bad method error

[kletze]

Sending commands from client to server results in a bad method error.

Steps to reproduce the error:

The server is up and running.
Sending commands via netcat from the client:
echo -e "PING0\x0\x0\x0\x0" | nc 10.42.0.200 4001
Server and client are directly connected via lan. The error also occurs when sending the command directly from the raspberry pi to the localhost.

Behaviour of the server:

server returns a bad method error:
Error: bad method
It seems like the method ws.accept() in main fails.

Comment

I followed all the steps in the tutorial. The simple_opencv_app and the usb_test_rpiasgige are running without problems.
Am I missing something related to the network connection?
Could this be related to this Issue?

[kletze]

The error is caused by the command using the syntax echo 'PING' | websocat ws://10.42.0.200:4001 returns the expected PONG