• All mitmproxy tools are now Python 3 only! We plan to support Python 3.5 and higher.
• Web-Based User Interface: Mitmproxy now offically has a web-based user interface
  called mitmweb. We consider it stable for all features currently exposed
  in the UI, but it still misses a lot of mitmproxy’s options.
• Windows Compatibility: With mitmweb, mitmproxy is now useable on Windows.
  We are also introducing an installer (kindly sponsored by BitRock) that
  simplifies setup.
• Configuration: The config file format is now a single YAML file. In most cases,
  converting to the new format should be trivial - please see the docs for
  more information.
• Console: Significant UI improvements - including sorting of flows by
  size, type and url, status bar improvements, much faster indentation for
  HTTP views, and more.
• HTTP/2: Significant improvements, but is temporarily disabled by default
  due to wide-spread protocol implementation errors on some large website
• WebSocket: The protocol implementation is now mature, and is enabled by
  default. Complete UI support is coming in the next release. Hooks for
  message interception and manipulation are available.
• A myriad of other small improvements throughout the project.