The WebSocket API mentions some domains in the documentation, i.e.
However, I can't find a comprehensive list of supported domains. What is presently supported?
What domains are planned for in the future?
Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
The list of supported domains are listed in "Request" section of the API document (<WebSocket EAP 3 package>/doc/request-message.html file)
save on_message data
Delayed service available
Establish a websocket connection and set headers?
Issue tracking by looking at logs
Response validation for IDN_SELECTFEED Refresh request via Web Socket API