Broadcasting a message to a single user in a WebSocket application
In the previous section, we saw a WebSocket application of the multiple subscriber model, in which a broker sent messages to a topic. Since all clients had subscribed to the same topic, all of them received messages. Now, you are asked to develop an application that targets a specific user in a WebSocket chat application.
Suppose you want to develop an automated answering application in which a user sends a question to the system and gets an answer automatically. The application is almost the same as the previous one (STOMP over WebSocket and the fallback option in Spring 4), except that we should change the WebSocket configurer and endpoint on the server side and subscription
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