Charles is a Scripts software developed by Karl von Randow. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Charles:

Edit by Marydown: Charles is an HTTP proxy / HTTP Monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).