Debugging with Fiddler: The complete reference from the by Eric Lawrence

By Eric Lawrence

Fiddler is an internet Debugging Proxy platform that screens and modifies net site visitors. This freeware software allows builders, testers, and fans to examine site visitors, set breakpoints, and "fiddle" with incoming or outgoing info. Fiddler comprises robust event-based scripting, and will be prolonged utilizing any .NET language. FiddlerCore, the center proxy engine underlying Fiddler, is offered to combine into any .NET software. during this ebook, you'll discover ways to totally make the most the facility of Fiddler to debug site visitors from almost any web-related program, together with net Explorer, Google Chrome, Apple Safari, Mozilla Firefox, Opera, and millions extra. You'll see easy methods to debug HTTPS site visitors, and use Fiddler with well known units like iPhone/iPod/iPad, home windows mobile, and others. After exploring the loads of integrated good points, you'll discover ways to expand Fiddler utilizing the FiddlerScript engine or construct your personal purposes atop the FiddlerCore category library.

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Additional resources for Debugging with Fiddler: The complete reference from the creator of the Fiddler Web Debugger

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The Compare Sessions item is enabled only if two sessions are selected in the Web Sessions list. When clicked, a differencing tool will be used to compare the two Sessions. The HOSTS… item opens Fiddler’s Host Remapping tool. The View Menu The Squish Session List toggle controls whether the Web Sessions list is collapsed horizontally, giving you more room to view Inspectors and other tabs. You can toggle this setting by pressing the F6 key. The Stacked Layout list reorganizes the Fiddler user-interface such that the Web Sessions list appears atop the tabs.

The Set request header option allows you to create or update a HTTP Request header with a value of your choice. Breakpoints The breakpoints box enables you to break requests or responses that contain the specified attributes. Break request on POST option will set a request breakpoint for any request whose method is POST. The Break request on GET with QueryString option will set a request breakpoint for any GET request whose URL contains a query string. The Break on XMLHttpRequest option will set a request breakpoint for any request that can be determined to have been issued by the XMLHttpRequest object.

Shows the Fiddler Toolbar if it was hidden. Removes the Inspectors from the main Fiddler window and shows them in a floating window instead. If the command entered in QuickExec does not match any of the above intrinsic commands, FiddlerScript and Fiddler Extensions will have the opportunity to respond to the command. Default FiddlerScript Commands The default FiddlerScript file used by Fiddler adds a number of useful commands which can be launched from the QuickExec box. Command bold urltext bps status bpm method Action Applies font bolding to any future Session whose URL contains the specified text.

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