I wanted to build a burp extension to forward the request's response to rabbitMQ. But following this tutorial: https://portswigger.net/burp/documentation/desktop/extensions/creating, the burp suite gave an error for proxy.registerResponseHandler() while loading the plugin:
After lots of googling and debugging, I couldn't resolve it. I even tried to load their own example extension, which also gave the same error(proxyhandler).
Since their own example wasn't working I decided to use legacy API to create the extension. On following the old tutorial: https://portswigger.net/burp/extender/writing-your-first-burp-suite-extension, it actually saved the Montoya API interface files:
In the saved interface files, there was no function for which we initially got in the error:
java.lang.NoSuchMethodError: 'burp.api.montoya.core.Registration burp.api.montoya.proxy.Proxy.registerResponseHandler(burp.api.montoya.proxy.http.ProxyResponseHandler)'
It was actually named as:
ResponseInitialInterceptResult handleReceivedResponse(InterceptedHttpResponse interceptedResponse, HttpRequest initiatingRequest, Annotations annotations){}
and
ResponseFinalInterceptResult handleResponseToReturn(InterceptedHttpResponse interceptedResponse, HttpRequest initiatingRequest, Annotations annotations){}
Implementing these functions solved my problem. Hope this helps.
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