Fiddler Web Debugger

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

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  • Blog Post: My book “Debugging with Fiddler”, is now available

    I’m delighted to announce that my new full-length book on Fiddler is now available. Weighing in at 330 pages, it covers every feature in Fiddler, and provides the most comprehensive available documentation of how to develop Fiddler extensions (including Inspectors, Transcoders, and IFiddlerExtensions...
  • Blog Post: Sneak Peek at Table of Contents for the Upcoming Fiddler Book

    Table of Contents Acknowledgements............................................................................................................................................................ iii Table of Contents..................................................................................
  • 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: Revisiting Fiddler and Win8+ Immersive applications

    Back in September, I blogged about the configuration steps required to debug Windows 8 Immersive (“Metro-style”) apps using Fiddler . Since that post was originally written, I’ve made available a new version of Fiddler which runs natively on the .NETv4 Framework, enabling Windows 8...
  • Blog Post: Glimpse of the future: Fiddler and HTML5 WebSockets

    Much work remains, but the basic architecture is in place for Fiddling with both secure and insecure HTML5 WebSockets:
  • Blog Post: News on Fiddler Surveys and Telemetry

    For this morning’s post, I wanted to give everyone a quick picture of some of the data I've collected about Fiddler usage, how I plan to respond, and how I will continue to learn more. I’ve recently had the chance to run some surveys and spend some time with developers who are using Fiddler...
  • Blog Post: Generating HTML5 AppCache Manifests with Fiddler

    HTML5 introduces the concept of an Application Cache, which allows a web developer to provide a manifest of pages that should be cached to permit offline use. You can see an instance of AppCache over on the IETestDrive site ; if you examine the markup, you can find that the HTML tag contains a manifest...
  • Blog Post: Fiddler and Windows 8 Metro-style applications

    Over on StackOverflow, a new Windows 8 user asked how to get Fiddler working with new Windows 8 Metro-style applications. These applications work somewhat differently than classic desktop applications, and require a bit of special configuration work to get Fiddler to work properly. Fear not, however...
  • Blog Post: Fiddler and Channel Binding Tokens Revisited

    Just under a year ago, I wrote a blog post about how the new “Extended Protection” feature (also known as Channel Binding Tokens or CBT) prevented seamless decryption of certain authenticated HTTPS traffic when Fiddler is running. The quick recap is that CBT binds a set of NTLM or Kerberos...
  • 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: Fiddler before Fiddler

    I think origin stories are fun. I spoke about the origins of Fiddler in my talk at the PDC last year, and it was interesting to share how a little idea bloomed into a surprisingly widely-used piece of software. Cleaning up some old hard drives a few weeks ago, I found an old UI prototype that I’d...
  • Blog Post: Fiddler and the IE9 Release Candidate

    I’m delighted to announce that the now-available IE9 RC includes three significant enhancements for users of proxy-based debuggers like Fiddler. These improvements are: The default Connections-Per-Proxy limit has been raised from 6 to 12, improving performance and in some cases reducing...
  • 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: FiddlerCap Now in Six Languages

    The FiddlerCap Web Traffic Recorder allows non-technical end-users to collect Web Traffic captures, and send those captures to a debugging buddy for analysis. I recently updated FiddlerCap and it can now render in any of six languages: English, Spanish, French, Japanese, Russian, and Portuguese. The...
  • 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: Announcing Fiddler 2.2.9

    The Beta version of Fiddler 2.2.9 is now available for download . The update notification 's changelist hits the highlights, but there's a ton of new goodies in the new version which I'll be talking about over the next week or so. Beyond a huge crop of architectural and performance improvements, there...
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