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 RequestContent-Type: text/html;charset=us-asciiServer: Microsoft-HTTPAPI/2.0Date: Wed, 22 Aug 2012 19:59:52 GMTConnection: closeContent-Length: 334 <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN”””><HTML><HEAD><TITLE>Bad Request</TITLE><META HTTP-EQUIV=”Content-Type” Content=”text/html; charset=us-ascii”></HEAD><BODY><h2>Bad Request – Invalid Hostname</h2><hr><p>HTTP Error 400….


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 users to run Fiddler without installing older versions of the Framework. As…


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 attribute…


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, Windows 8 and Fiddler get along just fine after…