Charles 4.1 – Java HTTP proxy and monitor.

Charles 4.1

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 4.1:

Major new features:
  • Protobuf 3 support (and Protobuf descriptor registry, for parsing your Protobuf messages)
  • HiDPI support on Windows and Linux
  • Flow chart (to explore the profile of a connection over time)
  • Linux versions now include a custom JRE, and no longer require Java to be installed separately
Minor new features:
  • More info for unproxied SSL traffic, including protocol and ciphers
  • More closely match the SSL protocol and cipher negotiated between client and server when SSL Proxying
  • Client Process tool performance optimisation
  • Added Copy Image and Export Image options to the Chart viewer
  • ACL now supports IPv6 addresses
  • Expanded support for extended JSON mime types
Bug fixes:
  • Hangs on macOS after sleep or GPU change have been resolved (thank you to the many users who participated in testing this!)
  • HTTP 2 stability improved when using Chrome
  • SOCKS proxy now respects incoming IP address, rather than doing a DNS lookup


OS X 10.7 or later


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