WebSocket handshake: Unexpected response code: 404

Question

Am writing my first websocket program and am getting \"WebSocket handshake: Unexpected response code: 404\", error while loading the webpage.

I am using

Answer 1

It's because of the issue of /info=34424 - with 404 error - that I had to abandon using the xml approach suggested at other places. I have Spring 4.2 in my project and many SockJS Stomp implementations usually work well with Spring Boot implementations. This implementation from Baeldung worked(for me without changing from Spring 4.2 to 5). After Using the dependencies mentioned in his blog, it still gave me ClassNotFoundError. I added the below dependency to fix it.

        org.springframework
        spring-core
        4.2.3.RELEASE
    

Baeldung's implementation curiously does not make any such calls

flow/websocket/add/info?t=1540813753999

What it does (on send and receive) is below. I am only pasting it in case people well-versed with these libraries can further add insights on this forum.

 >>> SEND
destination:/app/chat
content-length:38

{"from":"nicholas","text":"try again"}

<<< MESSAGE
destination:/topic/messages
content-type:application/json;charset=UTF-8
subscription:sub-0
message-id:m3p096zk-11
content-length:53

{"from":"nicholas","text":"try again","time":"13:46"}