Need Java https proxy which can be enhanced to emulate production https proxy behaviour

I have a production environment which require access through a proxy server. Occasionally said server returns blank responses badly confusing the Metro web service library causing all kinds of interesting RuntimeExceptions. I believe the proxy is Squid.

In order to handle these better, I would 开发者_开发百科like to set up a similar scenario here with a local proxy under my control causing all kinds of interesting failures. A quick survey strongly indicated I was not asking right.

So, the question is, is there a simple, open source HTTPS/HTTP whatever proxy written in Java suitable for this purpose?

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Maybe Apache TCPMon could be useful.