Charles 4.0 – Java HTTP proxy and monitor.

Charles 4.0

Charles is a web proxy (HTTP Proxy / HTTP Monitor) that runs on your own computer. Your web browser (or any other Internet application) is then configured to access the Internet through Charles, and Charles is then able to record and display for you all of the data that is sent and received.

  • SSL proxying: view SSL requests and responses in plain text
  • Bandwidth throttling to simulate slower Internet connections including latency
  • AJAX debugging : view XML and JSON requests and responses as a tree or as text
  • AMF: view the contents of Flash Remoting / Flex Remoting messages as a tree
  • Repeat requests to test back-end changes
  • Edit requests to test different inputs
  • Breakpoints to intercept and edit requests or responses
  • Validate recorded HTML, CSS, and RSS/atom responses using the W3C validator

What’s New

Version 4.0:

Major Features
  • HTTP 2 support
  • IPv6 support
  • Updated look and feel
    • Enhanced app icon
    • Beautiful new custom designed icons for the toolbar and in the session navigator tree
    • Improved tab visual design on Mac OS X
    • Improved compatibility with Windows 10
    • Reduced border chrome
  • Improved performance
Minor Features
  • Command-line tool to export SSL certificates
  • Notes field added to Sequence view
  • XML summary export now includes headers
  • JSON export format
  • Kept-Alive count visible on Host and Path summaries
  • Uncompressed sizes added to Summary tab


OS X 10.7 or later


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