Compare Web Traffic

Compare two web sessions

1. Select two sessions in the Web Sessions List.
2. Right-click one of the sessions.
3. Click Compare from the context menu.

By default, this will attempt to launch WinDiff or WinMerge to compare the traffic.

Tips:

• If you're using WinDiff, you can cause it to break each line on punctuation by holding ALT or SHIFT while clicking on the Compare menu item.

*You can set the fiddler.differ.ultradiff [preference][5] to False if you don't want Fiddler Classic to attempt to reorganize the headers and URL for simpler diffing when saving the files.

Change default text comparison tool

1. Click Tools > Options > Tools.
2. Enter the location for the tool executable.

Set custom command-line arguments

In the QuickExec box:

1. Provide the path to the tool: PREFS SET fiddler.config.path.differ "C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe"
2. Configure the command line to match what the tool expects: PREFS SET fiddler.differ.Params "/diff \"{0}\" \"{1}\""
3. (Optional) Set an alternate command line that will be invoked if you hold ALT or SHIFT while invoking the comparison: PREFS SET fiddler.differ.ParamsAlt "/diff /binary \"{0}\" \"{1}\""

Compare multiple sessions at once

The Traffic Differ Extension allows you to compare multiple sessions at a time.