TIL: Snooping on a local connection

Snooping on an iOS simulator hitting a server running on localhost has always been a thorn in my side. With macOS Sierra tools have once again changed and I've once again solved this problem using a neat little tool called mitmproxy.

  1. Install mitmproxy - via homebrew

    brew install mitmproxy

  2. Edit your /etc/hosts to add a local domain if you haven't already:

    sudo vi /etc/hosts add 127.0.0.1 l.local to the bottom.

  3. Reload your etc/hosts

    sudo killall -HUP mDNSResponder

  4. Launch mitmproxy on the port (-p) the simulator is configured to hit, redirecting (-R) to the port your application is running locally.

    mitmproxy -p3000 -R http://l.local:5000

See the requests and responses populate the mitmproxy!