javascript - The onmessage event will not trigger when using a Java server

I have encountered an issue with my Java server and JavaScript websocket client. Despite trying various solutions from this site, I am still unable to resolve the problem. So, I decided to share my code here in hopes of getting some assistance.

The problem arises when I try to send information from the server to the client or vice versa. Nothing seems to happen on either end. Can someone please help me debug this issue?

Below is the snippet of my server-side code:

 (Java code goes here...)

As for my client-side code, here it is:

 (HTML/JavaScript code goes here...)

Your assistance in resolving this matter would be greatly appreciated. Thank you!

javajavascriptwebsocket

Answer №1

The primary issue that needs attention is the handle handshake process.

Modify:

msg += "Sec-WebSocket-Accept: " + hash_str;

to:

msg += "Sec-WebSocket-Accept: " + hash_str;

This modification will prevent the handshake from ending with three "\r\n". When the client reads in the handshake, it stops after the first two, leaving the third in the stream. As a result, the last \r\n may be interpreted as part of the data the client attempts to read next. Sending a message to the client in this state could lead to disconnection due to a bad opcode error.

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