Fiddler Web Debugger

Fiddler is a web debugging tool which is owned, developed, and distributed by Eric Lawrence.

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  • Blog Post: Cookie Scanning with Fiddler

    With the recent kerfuffle about sites providing misleading P3P statements , I decided to throw together a quick Fiddler add-on that displays privacy information simply in the Fiddler UI. Install the new Privacy Scanner add-on and Fiddler will gain a new top-level menu named Privacy. The...
  • Blog Post: New Tricks in Fiddler 2.3.8.2

    The new Fiddler Beta has a few useful tricks. First, you can copy a DataURI to your clipboard (from Fiddler itself, or anywhere else): and use the new Edit > Paste Files as Sessions command: … to instruct Fiddler to parse the DataURI and create a new Session for it....
  • Blog Post: MIX2011 Fiddler talk is now live

    My talk at this year’s MIX conference is now complete and the video, slides, and references are now available for download. See https://www.fiddler2.com/mix/ for links. One of demos showed off a simple little extension that can be used to manipulate GeoLocation web service responses, allowing...
  • Blog Post: New Features in Fiddler 2.2.9.9 Beta

    New features and fixes in the Beta . The Find Sessions feature (CTRL+F) now supports searching with regular expressions. Enhanced the "Compare Sessions" feature on the context menu (set fiddler.differ.ultradiff = "False" if you don't like it) Use a preference to persist the Scaling Mode preference...
  • Blog Post: New Features in FiddlerCore 2.2.9.9

    Version 2.2.9.9 of the FiddlerCore .NET class library has been released . This new version includes a number of new features that make FiddlerCore more useful for a variety of traffic monitoring and capture scenarios. With the exception of the final improvement (Server Read Callback), all of these improvements...
  • Blog Post: Fiddler’s New Import and Export Architecture

    All versions of Fiddler support a rich extensibility model that enables developers to enhance Fiddler with new functionality useful for traffic inspection, analysis, and sharing. However, writing extensions that import traffic captured by other tools was difficult, and extensions that offered traffic...
  • Blog Post: Fiddler New Features – The Preferences System

    Fiddler 2.2.9 is the first release with end-to-end support for a Preferences System , accessible to script and extensions, that will simplify the storage and reloading of user-preferences. The system is somewhat similar to the preferences system within many web browsers; as in those browsers, you...
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