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I am trying to route all my browser traffic through an HTTP proxy for debugging reasons. I have tried mitmproxy and burp, with Firefox, Safari and Chrome on Mac OS X.

The problem I'm having is that HTTP traffic is shown in the proxy and can be logged, manipulated etc. but HTTPS traffic is only shown when I use curl from the command line. When using one of the browser, HTTPS pages load as normal, but they are not shown/logged in mitmproxy or burp. I looks like the browser bypass the proxy for HTTPS requests.

What can I do to debug HTTPS connections?

EDIT (because I lack the reputation to answer myself): As a permanent monument to my own stupidity, here is the answer:

In Mac OS X, two boxes need to ticked for the system (and thus the browser) to use a HTTP proxy: one box for HTTP and another for HTTPS. I had just ticked the HTTP box.

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