Charles是一款HTTP代理服务器/HTTP监视器/反向代理服务器，当程序通过Charles的代理访问互联网时，Charles可以监控这个程序发送和接收的所有数据。它允许开发者查看所有连接互联网的HTTP通信，这些包括request, response和HTTP headers （包含cookies与caching信息），有些同学可能会问，chrome的开发者工具不是集成了吗？小编想说，那你是没经历过移动开发调试
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