Charles

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.

Features

• 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

Note: Version 4 is a paid upgrade from previous versions. Upgrade information can be found here.

Security:

• Fixes a local privilege escalation vulnerability on macOS.

Improvements:

• Hostname filter added to Structure view
• Websockets: added right-click to export all messages as individual files
• SSL Proxying support extended to Port Forwarding and non-HTTP SOCKS traffic
• Charles no longer prevents sleep on macOS
• SOCKS TLS connections now get a host name instead of just an IP address
• Many internal improvements to the minutiae of proxying, including reduced usage of chunked responses when they weren't warranted, and improved Expect/Continue behaviour.

Bug fixes:

• Map Remote and Map Local bugs fixed that prevents correct https -> http and http -> https mappings
• Authentication viewers fixes to display of bearer tokens and similar
• HTTP 2 over Reverse Proxy improved cURL-compatible URL creation fixed for HTTP 2
• Windows: some native code loading issues fixed, which prevented Charles from automatically controlling the Windows Proxy