Charles. 能够允许你查看，你的主机发起的所有HTTP会话的REQUEST RESPONSE
如果仅仅是这样的话，当然还有很多类似的HTTP截包器，但是CHARLES内建了对flex AMF0 和AMF3的支持，通过CHARLES你还可以清楚的看到在服务端和客户端之间流动的 AMF数据流，这就给你的DEBUG带来了极大的便利，所以如果你是一个忠实的FLEX开发人员，而你又没有使用过CHARLES，那么极度推荐你试试
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy
that enables a developer to view all of the HTTP traffic between their
machine and the Internet. This includes requests, responses and the
HTTP headers (which contain the cookies and caching information).Charles is especially useful for Adobe Flash developers as you can
view the contents of LoadVariables, LoadMovie and XML loads. Charles
also has native support for Flash Remoting (AMF0 and AMF3).