Fiddler Web Debugger
Fiddler is a web debugging tool which is owned, developed, and distributed by Eric Lawrence.
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Fiddler Web Debugger
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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 following URL http://ipv4.fiddler:2468/, I get an unexpected error message. HTTP/1.1 400 Bad Request Content-Type: text/html; charset=us-ascii Server: Microsoft-HTTPAPI/2.0 Date: Wed, 22 Aug 2012 19...
22 Aug 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 their .NET programs or from any program when Fiddler is configured to decrypt traffic. Notably, these users only have problems when running on Windows Vista or later. So, what’s going on? When...
28 Mar 2012
.NET HttpWebRequests and Expect: 100-continue
Recently, a colleague asked me to look at a network capture in which a .NET client application’s communication with a web service was not meeting their performance goals. In particular, he noted that this was primarily a problem on high-latency networks; each of the dozens of requests took hundreds...
5 Nov 2011
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...
4 Sep 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 environment, where IPv4 is entirely disabled. On startup, he saw the following message: The problem here is an obscure one, which makes it somewhat interesting. What’s happening is that Fiddler...
22 Jun 2011
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...
10 Feb 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, I’ve acquired the LG Quantum phone, and naturally, one of my first goals was to start looking at the traffic from mobile Internet Explorer and some of my WP7 applications. The process for capturing...
8 Jan 2011
Fiddler and Channel-Binding-Tokens
Note: Please see this post for an update. Some users of Fiddler who have HTTPS Decryption enabled have found that some of their internal HTTPS sites that used to work properly with Fiddler now endlessly prompt for credentials while Fiddler is running. Even typing the correct credentials into the authentication...
15 Oct 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 Windows Phone Emulator only. Recently, some developers have asked me why Fiddler no longer works with the Windows Phone 7 emulator. Fiddler properly captured traffic from the CTP version of the emulator...
15 Oct 2010
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...
30 Jun 2010
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