Debugging with Fiddler.2012

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Debugging with Fiddler

The complete reference from the creator of the Fiddler Web Debugger

Eric Lawrence

ii | Introduction

Debugging with Fiddler

Cover Photo: Nicholas Wave; ©IStockPhoto.com/@by_nicholas

I’ve spent developing Fiddler, I spent nine months on this book and I’d like to be able to pay for the coffee I drank while writing it.

Book Version LULU 1.00 / Fiddler Version 2.3.9.9

Legalese

Trademarks mentioned in this book are (obviously) the property of their respective owners, and are only used to identify the

products or services mentioned.

This book is provided "as is.” In no event shall I, the author, be liable for any consequential, special, incidental or indirect damages

of any kind arising out of the delivery, accuracy, or use of this book. This book was written with care, but no one warrants that it is

error-free. On the contrary, I guarantee that this book contains at least a few errors, and I promise to be suitably embarrassed when

you point them out to me (http://fiddlerbook.com/errata) so that I may update the next version.

e_lawrence@hotmail.com

@ericlaw on Twitter

iii | Introduction

AC K NO W L E DG E M E NTS

This book, and Fiddler itself, would not have been possible without myriad contributions from hundreds of people

around the world.

First, I’d like to thank my wife Jane, a source of inspiration, encouragement, and immense patience as I’ve spent

innumerable nights and weekends working on Fiddler and authoring this book. Next, thanks to my parents and

grandmother, who instilled in me a voracious appetite for books and the idea that one day I should try my hand at

writing one. I beg my friends’ forgiveness for declining so many gatherings over the years to stay home and write

more code.

I’m grateful for the many contributions of colleagues too numerous to mention (they know who they are!), and to the

broader Fiddler community for providing a steady stream of encouragement, suggestions and bug reports. My

colleague Jim Moore warrants a special mention for his careful review of the draft version of this book, and his

valuable feedback on Fiddler over the years. I’d also like to acknowledge the many dozens of donors who supported

Fiddler financially as it became costly to maintain and distribute.

Lastly, I’d like to thank you, dear reader, for caring enough about Fiddler to pick up this book!

iv | Introduction

TA B L E O F CO N T E N T S

Acknowledgements .........................................................................................................................................iii

Table of Contents ............................................................................................................................................. iv

INTRODUCTION ............................................................................................................. 1

Origins .............................................................................................................................................................. 2

About this book............................................................................................................................................ 4

A Quick Primer ................................................................................................................................................. 6

Basic Concepts ............................................................................................................................................. 6

Usage Scenarios ........................................................................................................................................... 7

An Incomplete List of Things Fiddler Can Do ....................................................................................... 7

An Incomplete List of Things Fiddler Cannot Do ................................................................................. 7

EXPLORING FIDDLER ..................................................................................................... 9

Getting Started ................................................................................................................................................ 10

System Requirements ................................................................................................................................ 10

Installing Fiddler........................................................................................................................................ 10

Permissions and XCOPY Deployment ................................................................................................. 10

Updating Fiddler ....................................................................................................................................... 11

Uninstalling Fiddler................................................................................................................................... 11

The Fiddler User-Interface ............................................................................................................................. 12

The Web Sessions List ............................................................................................................................... 12

Understanding Icons and Colors .......................................................................................................... 13

Keyboard Reference .............................................................................................................................. 15

Web Sessions Context Menu ..................................................................................................................... 15

Fiddler’s Main Menu ...................................................................................................................................... 20

The File Menu ............................................................................................................................................ 20

The Edit Menu ........................................................................................................................................... 20

The Rules Menu ......................................................................................................................................... 21

Performance Submenu .......................................................................................................................... 22

The Tools Menu ......................................................................................................................................... 23

The View Menu.......................................................................................................................................... 23

The Help Menu .......................................................................................................................................... 24

Fiddler’s About Box .............................................................................................................................. 25

v | Introduction

Fiddler’s Toolbar ............................................................................................................................................ 26

Fiddler’s Status Bar .................................................................................................................................... 27

QuickExec ....................................................................................................................................................... 28

QuickExec Selection Commands .......................................................................................................... 28

Default FiddlerScript Commands ........................................................................................................ 30

Application Hotkeys ...................................................................................................................................... 33

Statistics Tab ................................................................................................................................................... 34

The Filters tab ................................................................................................................................................. 36

Hosts ...................................................................................................................................................... 36

Client Process ........................................................................................................................................ 37

Request Headers.................................................................................................................................... 37

Breakpoints ............................................................................................................................................ 38

Response Status Code ........................................................................................................................... 38

Response Type and Size ........................................................................................................................ 39

Response Headers ................................................................................................................................. 39

The Timeline tab ............................................................................................................................................. 40

Mode: Timeline .......................................................................................................................................... 40

Mode: Client Pipe Map .............................................................................................................................. 41

Mode: Server Pipe Map ............................................................................................................................. 42

Using the Timeline for Performance Analysis.......................................................................................... 42

The AutoResponder tab ................................................................................................................................. 43

Specifying the Match Condition ............................................................................................................... 44

Matching Against Request Bodies ........................................................................................................ 45

Specifying the Action Text ........................................................................................................................ 45

Using RegEx Replacements in Action Text .............................................................................................. 46

Drag-and-Drop support ............................................................................................................................ 47

FARX Files .................................................................................................................................................. 48

The TextWizard .............................................................................................................................................. 49

Character Encodings .................................................................................................................................. 50

The Composer tab .......................................................................................................................................... 51

Request Options .................................................................................................................................... 51

Raw Requests ........................................................................................................................................ 52

Parsed Requests ..................................................................................................................................... 52

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DebuggingwithFiddlerThecompletereferencefromthecreatoroftheFiddlerWebDebuggerEricLawrenceii|IntroductionDebuggingwithFiddlerCoverPhoto:NicholasWave;©IStockPhoto.com/@by_nicholasEverythingelse:©2012EricLawrence.Allrightsreserved.Pleasedon’tpiratethisbookinwholeorinpart.BeyondthenineyearsI’vespentdeve...

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