Charles is a HTTP proxy, monitor and reverse proxy that enables developers to view HTTP and SSL traffic coming from and to their machine. Web browsers access the internet through this software so that users can diagnose excess traffic and fix the problem. In terms of time efficiency, debugging is as fast and reliable as possible. Features include SSL Proxying, useful to view SSL requests in plain text; bandwidth throttling simulating latency and other slow connection malfunctions; AJAX debugging; AMF displaying contents of Flash Remoting or Flex Remoting as a tree.
Back-end changes can be tested through repeated requests. Different inputs are also verifiable by editing requests. HTML, CSS and RSS responses are validated using the W3C checker. Every feature comes out of the box, system and browser proxy settings being auto configured.