Websocket connection fails when using DC UI on Chrome and Edge

[taban03]

Describe the bug
When using the Discoverable Client UI on Safari and Firefox, the webscoket communication is successfully established. However it fails when using Chrome or Edge.
The error displayed in the console on Edge says:

hello.js:31 
        
       WebSocket connection to 'wss://user:pass@localhost:10012/discoverableclient/ws/uppercase' failed: Error during WebSocket handshake: Incorrect 'Sec-WebSocket-Accept' header value

Steps to Reproduce

1. Go to https://localhost:10012/discoverableclient/ using either Chrome or Edge
2. Observe the message Websocket connection failed under the WebSockets input label

Expected behavior
A clear and concise description of what you expected to happen.

API Catalog Web UI (in case of API Catalog issue):

• Browser [e.g. Chrome, Microsoft Edge]

https://github.com/zowe/api-layer/wiki/Issue-management

[anton-brezina]

#2603