17 April 2009 | 15,039 views

Charles Web Debugging Proxy – HTTP Monitor & Reverse Proxy

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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 can act as a man-in-the-middle for HTTP/SSL communication, enabling you to debug the content of your HTTPS sessions.

Charles simulates modem speeds by effectively throttling your bandwidth and introducing latency, so that you can experience an entire website as a modem user might (bandwidth simulator).

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).

Charles is also useful for XML development in web browsers, such as AJAX (Asynchronous Javascript and XML) and XMLHTTP, as it enables you to see the actual XML that is flowing between the client and the server. Charles natively supports JSON, JSON-RPC and SOAP; displaying each in a simplified tree format for easy viewing and debugging.

You can download Charles Proxy here:

Windows – charles_setup.exe
Linux / Unix – charles.tar.gz
Mac OS X – charles_macosx.zip

Or read more here.



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3 Responses to “Charles Web Debugging Proxy – HTTP Monitor & Reverse Proxy”

  1. plunge 17 April 2009 at 8:40 am Permalink

    Looking forward to checking this out, I’m currently using Fiddler2 which is Windows-only..

    After re-reading your post Charles may have significantly better features than F2, also. :)

  2. Jack 18 April 2009 at 8:02 am Permalink

    Thanks for sharing, I also use Fiddler. I use it for more than 2 years, hope to find better tools

  3. Andy Davies 1 May 2009 at 8:19 pm Permalink

    I’ve used Charles on and off for a few years, it’s a great tool and I’d highly recommend it.