Update messaging.py for proxy use

@fabpiaf please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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Contributor License Agreement

### Contribution License Agreement This Contribution License Agreement (**“Agreement”**) is agreed to by the party signing below (**“You”**), and conveys certain license rights to Microsoft Corporation and its affiliates (“Microsoft”) for Your contributions to Microsoft open source projects. 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microsoft / restler-fuzzer

Update messaging.py for proxy use #875