httptoolkit-server

I'm the author. I'm not a Go developer though, can you give me an example I can reproduce for `go get` that doesn't work for you? For the terminal, there's a few mechanisms, but environment variables are the catch-all there, yes (full list: https://github.com/httptoolkit/httptoolkit-server/blob/maste...). Those do work for most cases, but it is absolutely not a hard guarantee for applications that actively ignore standard proxy configuration (handling that is very hard, and definitely out of scope here). Go does generally observes `http_proxy` correctly by default in other cases I've tested, so this vert simple code from the test suite is automatically intercepted for example: https://github.com/httptoolkit/httptoolkit-server/blob/maste.... Very happy to look into any failing cases you can share.

I'm the author, that's exactly it! The contents of that interceptors folder should give you an idea how it all works: https://github.com/httptoolkit/httptoolkit-server/tree/maste... It actually doesn't install system certificates at all though. It doesn't change any system configuration whatsoever, and it doesn't need any admin/root privileges. The deb package doesn't do anything different to any others. That's because the key differentiator of HTTP Toolkit vs Fiddler/Charles/mitmproxy etc, is that it provides targeted interception, rather than intercepting your entire system at once. That works by injecting cert & proxy config into a single browser window, intercepting specific Android apps, targeting individual Docker containers etc. That way you get much less noisy intercepted traffic for your debugging, and you can freely add rules to

From a quick look at the code, it seems to be doing something similar, except it does it for you. Here's a link to the Firefox bit, where it makes a custom Firefox profile and then injects a certificate into it: https://github.com/httptoolkit/httptoolkit-server/blob/maste... I haven't seen the source for the .deb package, but in theory it could add a system cert at installation time. I don't know if it does, though.