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Theme fund: NGI0 Entrust
Start: 2023-04
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Network infrastructure


HTTP/3 Support and OS Proxy Mode for intercepting local proxy

mitmproxy is a versatile tool for debugging, testing, privacy measurements, and penetration testing. It can be used to intercept, inspect, modify and replay network communication from websites and mobile applications.

This project is about the development of two new major features to mitmproxy: HTTP/3 Interception and a new OS proxy mode. With an increasing number of apps using the HTTP/3 protocol to communicate, we are adding support for it in mitmproxy so that it can be observed just as well as other protocols. For the second part of this project, we will be adding a new operating mode that makes it possible to inspect applications running on the user's device with a single click. These features collectively empower users to gain insights into what data their own devices are sending out.

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This project was funded through the NGI0 Entrust Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101069594.