Getting started with Fiddler

钟志zhongzhi@baidu.com

Introducing Fiddler

• Written in C# (.NET Framework v2.0)

• Freely available from

• HTTP/HTTPS Debugger

• Runs as a proxy server on the local machine or on a remote server

How does Fiddler work?

Internet Explorer

WinINET

Office

CryptoAPI WinHTTP

Fiddler

Firefox

CorpNET Proxy

example.com

Firewall

Debugging non-Windows clients

Fiddler InternetInternet

What can Fiddler do?

• HTTP/HTTPS traffic monitoring and analysis

• Request and response modification

• Timing and network manipulation

Monitor traffic

• Any device that supports a HTTP proxy• Process filter• Hide image request• Hide HTTPS CONNECTs• Hide 304 response• Filter• Find• Context menu select• QuickExec Box

QuickExec Box

• ?sometext

• >size

• <size

• =status

• =method

• @host

• select type

AutoResponser

• Creating your rules– String Literals– Exact Match– Regular Expressions– Set delay

• My Documents\Fiddler2\AutoResponder.xml

• +/-:reorder• delete:remove

Timeline

• Mime type color

• Color circle

• Buffering Mode vs. Streaming Mode

Buffering Mode/Streaming Mode

• Buffering Mode: modify the response before the client receives it

• Streaming Mode: return response bytes to the client immediately

Tools

• Host

• Simulate model speed

• Disable cache

• Text encoding/decoding

• GZIP Encoding

Addons

• Syntax-Highlighting

• JavaScript Formatter

• http://www.fiddler2.com/Fiddler2/extensions.asp

Customize Rules

• FiddlerScript(JScript.NET)

• Event base– onBeforeRequest– onBeforeResponse

• Auto loading

• Cutom command

• Baike Editor Demo

Demo: Debug online page

• http://fe.baidu.com/~zhongzhi/fiddler_demo/

More…

• http://www.fiddlertool.com/Fiddler2/