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Top WebSockets (2023) frequently asked interview questions | JavaInUse

WebSocket Framework Interview Questions

In this post we will look at WebSocket Interview questions. Examples are provided with explanation.

Q: What is WebSockets?
WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection.

Q: What are the disadvantages of using traditional HTTP request response communication model?

  • Traditional HTTP requests are unidirectional - In traditional client server communication, the client always initiates the request.
  • Half Duplex - User requests for a resource and the server then serves it to the client. The response is only sent after the request. So at a time only a single request occurs.
  • Multiple TCP connections - For each request a new TCPsession is needed to be established and then closed after receiving the response. So without using WebSockets we will have multiple sessions.
  • Heavy - Normal HTTP request and response require exchange of extra data between client and server.

Q: What are the advantages of using WebSockets over traditional HTTP communication?

  • WebSocket are bi-directional - Using WebSocket either client or server can initiate sending a message.

  • WebSocket are Full Duplex - The client and server communication is independent of each other.
  • Single TCP connection - The initial connection is using HTTP, then this connection gets upgraded to a socket based connection. This single connection is then used for all the future communication
  • Light - The WebSocket message data exchange is much lighter compared to http.

  • Q: How to create a WebSocket connection?
    	ws = new WebSocket('ws://localhost:8080/user');

    Q: Have you implemented WebSockets? What was the use case
    Have implemented WebSockets for a chat application using Spring Boot.
    Spring Boot Web Socket

    See Also

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