When testing modern applications, it is increasingly common to use WebSocket, a transport protocol as important as HTTP that allows maintaining persistent bidirectional connections between client and server.
To intercept and modify WebSocket traffic as easily as with static requests, it is necessary to have tools such as Burp Suite or ZAP Proxy that offer listening, editing, and real-time message forwarding functions.
With Burp Suite, you must enable the WebSocket interception option in the Proxy tab, then open the history to view incoming and outgoing frames and modify their content before forwarding them to the destination.
Similarly, in ZAP Proxy, by activating the WebSockets add-on, you can inspect each message, apply automated or manual transformations, and emulate server responses to test specific use cases or discover security vulnerabilities.
These techniques are useful for validating client behavior in functional tests of custom applications, platforms with artificial intelligence, or AI agents, and ensuring that the server response meets business and performance requirements.
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