Charles as a web proxy

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Worth a look over:

About Charles

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.

In Web and Internet development you are unable to see what is being sent and received between your web browser / client and the server. Without this visibility it is difficult and time-consuming to determine exactly where the fault is. Charles makes it easy to see what is happening, so you can quickly diagnose and fix problems.

Charles makes debugging quick, reliable and advanced; saving you time and frustration!
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 back-end 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

http://www.charlesproxy.com/download/la ... ownload.do