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.
Key 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 backend 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
Requires OS X 10.7 or later
What’s New:
Version 4.6.1:
Note: Version 4 is a paid upgrade from previous versions. Upgrade information can be found here.
Fixes Dark Mode support on macOS
Compatibility: OS X 10.7 or later, 64-bit processor