./osx_mitm.sh
http(s) proxy will will listen 8080 port. you can ajust it in osx_mitm.sh file.
you can view/edit http(s) flows in script/entry.py. Refer Mitmproxy API for details.
Wisit http://mitm.it to install root certificates
command line for Chrome to ignore securuty errors:
open -a Google\ Chrome --args --disable-web-security --allow-running-insecure-content --ignore-certificate-errors