Fiddler Web Debugger

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

Blog Closed: Fiddler now a part of the Telerik family

Read more here http://ericlawrence.com/fiddler/letterfromeric.asp.Find the new Fiddler blog here:...

Author: EricLaw [Edge] Date: 09/10/2012

Visual Studio 2012, IIS Express, and Fiddler

From the mail bag... Q:When I use IE10 on Windows 8 to visit an IIS Express instance using the...

Author: EricLaw [Edge] Date: 08/22/2012

Update on Fiddler Telemetry

Back in October of last year, I blogged the results of some surveys and announced that some...

Author: EricLaw [Edge] Date: 08/04/2012

Find Proxy Authentication bugs with Fiddler

Over on my other blog, I just posted an article showing how you can use Fiddler to find bugs in...

Author: EricLaw [Edge] Date: 08/03/2012

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...

Author: EricLaw [Edge] Date: 06/23/2012

Sneak Peek at Table of Contents for the Upcoming Fiddler Book

Table of Contents...

Author: EricLaw [Edge] Date: 04/26/2012

.NET HTTPS connections timeout on SNI TLS Warning

Recently, a handful of folks have emailed me complaining that some HTTPS sites cannot be reached by...

Author: EricLaw [Edge] Date: 03/28/2012

With the recent kerfuffle about sites providing misleading P3P statements, I decided to throw...

Author: EricLaw [Edge] Date: 02/21/2012

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...

Author: EricLaw [Edge] Date: 01/09/2012

ThinkPad Scrolling and Fiddler

I’m a long-time ThinkPad fan and owner—the keyboards are sublime, and I love the...

Author: EricLaw [Edge] Date: 12/29/2011

Revisiting Fiddler and Win8+ Immersive applications

Back in September, I blogged about the configuration steps required to debug Windows 8 Immersive...

Author: EricLaw [Edge] Date: 12/10/2011

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...

Author: EricLaw [Edge] Date: 11/21/2011

.NET HttpWebRequests and Expect: 100-continue

Recently, a colleague asked me to look at a network capture in which a .NET client...

Author: EricLaw [Edge] Date: 11/05/2011

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...

Author: EricLaw [Edge] Date: 10/07/2011

Generating HTML5 AppCache Manifests with Fiddler

HTML5 introduces the concept of an Application Cache, which allows a web developer to provide a...

Author: EricLaw [Edge] Date: 09/14/2011

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...

Author: EricLaw [Edge] Date: 09/14/2011

Fiddler and Channel Binding Tokens Revisited

Just under a year ago, I wrote a blog post about how the new “Extended Protection”...

Author: EricLaw [Edge] Date: 09/04/2011

Swapping out JQuery with Fiddler

This morning, someone asked me to look into a site-compatibility problem on a HTML5 demo site. When...

Author: EricLaw [Edge] Date: 08/19/2011

Fiddler and IPv6-only environments

I recently got a bug report from a user who was attempting to use Fiddler in a pure-IPv6...

Author: EricLaw [Edge] Date: 06/22/2011

MIX2011 Fiddler talk is now live

My talk at this year’s MIX conference is now complete and the video, slides, and references...

Author: EricLaw [Edge] Date: 04/14/2011

Mapping Sockets to a Process In .NET Code

One feature added to Fiddler a few years ago is the ability to map a given HTTP request back to the...

Author: EricLaw [Edge] Date: 03/09/2011

Fiddler before Fiddler

I think origin stories are fun. I spoke about the origins of Fiddler in my talk at the PDC last...

Author: EricLaw [Edge] Date: 03/08/2011

Fiddler and the IE9 Release Candidate

I’m delighted to announce that the now-available IE9 RC includes three significant...

Author: EricLaw [Edge] Date: 02/10/2011

Debugging Windows Phone 7 device traffic with Fiddler

Back in October, I showed how to debug Windows Phone emulator traffic with Fiddler . Since then,...

Author: EricLaw [Edge] Date: 01/08/2011

Fiddler and Silverlight Cross-Domain Requests

I’ve recently heard from a number of Silverlight developers who report that certain...

Author: EricLaw [Edge] Date: 11/21/2010

Fiddler and Channel-Binding-Tokens

Note: Please see this post for an update. Some users of Fiddler who have HTTPS Decryption enabled...

Author: EricLaw [Edge] Date: 10/15/2010

Fiddler and the Windows Phone 7 Emulator

Note: This post is part of a larger set on using Fiddler with Windows Phone 7. This post covers the...

Author: EricLaw [Edge] Date: 10/15/2010

FiddlerCore Update

FiddlerCore version 2.3.0.4 is now available for download. The primary change in this update is that...

Author: EricLaw [Edge] Date: 09/11/2010

Automatic Authentication with the Request Builder

The Request Builder feature in recent versions of Fiddler includes a number of enhancements,...

Author: EricLaw [Edge] Date: 08/12/2010

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...

Author: EricLaw [Edge] Date: 07/22/2010

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...

Author: EricLaw [Edge] Date: 07/18/2010

FiddlerCap Now in Six Languages

The FiddlerCap Web Traffic Recorder allows non-technical end-users to collect Web Traffic captures,...

Author: EricLaw [Edge] Date: 07/08/2010

Fiddler’s New Import and Export Architecture

All versions of Fiddler support a rich extensibility model that enables developers to enhance...

Author: EricLaw [Edge] Date: 06/30/2010

Capturing (and changing) a Web Site with Fiddler

Often, the IE team will encounter a problem in a complicated production website, and will need to...

Author: EricLaw [Edge] Date: 06/21/2010

No, Fiddler is not evil

Recently, a number of people have emailed me and indicated that their security software raised...

Author: EricLaw [Edge] Date: 05/07/2010

The Fiddler Community

With a development team of one, Fiddler is in many ways a product of the rich community and...

Author: EricLaw [Edge] Date: 05/07/2010

Peeking at Fiddler’s Internals

Fiddler 2.2.9 includes two new features that allow you to get some more insight into the state of...

Author: EricLaw [Edge] Date: 05/04/2010

FiddlerCore and the .NET Client Profile

As the .NET Framework grew in size from version to version, there was an increase in the clamor for...

Author: EricLaw [Edge] Date: 05/04/2010

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...

Author: EricLaw [Edge] Date: 05/03/2010

Fiddler New Features – DNS Failover

Fiddler 2.2.9 introduces a ton of new features under the hood. The one I’m going to talk about...

Author: EricLaw [Edge] Date: 05/03/2010

Announcing Fiddler 2.2.9

The Beta version of Fiddler 2.2.9 is now available for download. The update notification's...

Author: EricLaw [Edge] Date: 04/24/2010

Announcing the Fiddler Blog

Welcome to the new Fiddler blog on MSDN! I'm Eric, developer of the Fiddler Web Debugger. While I...

Author: EricLaw [Edge] Date: 04/24/2010