By default, you may select two sessions in Fiddler's Session list,
right-click one of them, and choose Compare from the context
menu. By default, this will attempt to launch WinDiff or WinMerge to compare the
traffic.
Q: Where can I get WinMerge?
WinMerge is open-source and available here.
Q: Where can I get Windiff?
Windiff is installed by various Microsoft Resource kits, and by many
versions of Visual Studio. You may already have it somewhere on your disk,
and only need to move it to somewhere within the system path (e.g.
C:\Windows) in order for Fiddler to find it.
Sadly, Windiff is not legally redistributable on its own. You may be
able to find a copy here
although I cannot vouch for any "pirate" distributions of Windiff.
Q: Can I set Fiddler to use a different text comparison tool like Odd
or Beyond Compare?
Yes, you only need to configure Fiddler to point to it.
- Close Fiddler.
- Run RegEdit
- Navigate to HKCU\Software\Microsoft\Fiddler2
- Add a new REG_SZ named CompareTool
- Set the new registry value to the path to your text comparison tool.
Q: How can I compare multiple sessions at once?
The Traffic Differ Extension allows
you to compare multiple sessions at a time.
Q: Any other hints?
Hint: You can force WinDiff to break each line on punctuation by holding
CONTROL or SHIFT while clicking on the Compare menu item.
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