Show how to write a simple WebSocket server application.
This Echo Server shows how to create a simple server application that sends back a reply in response to a message it receives, using the WebSocket API. For the sake of illustration, the reply is simply a copy of the message.
If your web browser supports WebSocket, you can also use it to open the echoserver/echoclient.html{echoclient.html} file, and operate as shown in the
following screenshot:

Otherwise use the WebSocket Echo Client to connect to the server.
See also WebSocket Echo Client.
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