How to Inject and Modify WebSocket Messages for Testing

For some reason, most online resources either completely omit the topic of intercepting and modifying WebSocket traffic, or cover it exclusively within the context of information security and vulnerability hunting. However, a WebSocket is a transport protocol just like HTTP. Therefore, when testing applications, it is essential to be able to work with WebSockets in the same way as with standard requests – by intercepting, modifying, and sending custom messages. Here you will learn how to intercept and modify messages using Burp Suite and ZAP Proxy to test client-side behavior and emulate server responses.

For some reason, most online resources either completely omit the topic of intercepting and modifying WebSocket traffic, or cover it exclusively within the context of information security and vulnerability hunting.

However, a WebSocket is a transport protocol just like HTTP. Therefore, when testing applications, it is essential to be able to work ...