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Debugging with FiddlerEric Lawrence@ericlaw

Lets talk about you

How did I end up here?

Did I imagine that Id grow up to have a network protocol as my license plate?

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In a word, no.

But after a decade of obsession with astronautics, I realized I was only really interested in technology, and specifically software.

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Once upon a timeOh no! What happened?

There must be a better way

A simple idea takes shape

All problems in computer science can be solved by another level of indirection.- David Wheeler Only two problemsDont know HTTPDont know C#

Fiddler: EvolutionEleven years,~35k lines of C#,160+ release builds,one full-length paperback,a cross-country move to Telerik,and two new supported platforms later

New WebsiteNew DocumentationNew PlatformsEnhanced User-InterfaceMy current side-project

A quick tour around Fiddler

UI Evolution The Web Sessions List

Fiddler on Linux (Mint/Ubuntu)

Limitations: No script engine. No WebView. No automatic proxy chaining. UI very glitchy on Mac.

15Fiddler on Mac OSXIt works, but due to UI glitches, youre usually better off using VirtualBox / Parallels / Fusion

Limitations: No script engine. No WebView. No automatic proxy chaining. UI very glitchy on Mac.

16Traffic MonitoringTypical Architecture

Debug Across Devices

Fiddler Windows/LinuxMacInternetiOSPhonesPCTabletsFiddler as a Reverse Proxy

http://fiddler2.com/r/?reverseproxyhttp://fiddler2.com/r/?reverseproxy

20Win8/8.1 Immersive Apps & IE11AppContainer blocks loopback network connections. For debugging purposes, you can disable that blocking.

Ctrl+Click to exempt all AppContainershttp://blogs.msdn.com/b/fiddler/archive/2011/12/10/fiddler-windows-8-apps-enable-loopback-network-isolation-exemption.aspx

21.NET Applications