官方版

Compare Web Traffic

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 to False if you don’t want Fiddler to attempt to reorganize the headers and URL for simpler diffing when saving the files.
Change default text comparison tool

Click Tools > Fiddler Options > Tools.
Enter the location for the tool executable.

Set custom command-line arguments
In the QuickExec box:

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"

Configure the command line to match what the tool expects:
```
PREFS SET fiddler.differ.Params "/diff \"{0}\" \"{1}\""
```
(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.

默认情况下，这将尝试启动WinDiff或WinMerge来比较流量。
提示:

如果您使用的是WinDiff，则可以通过在单击Compare菜单项时按住ALT或SHIFT来使其在标点符号的每一处断行。
如果您不希望Fiddler在保存文件时尝试重新组织标题和URL以简化比较，则可以将fiddler.differ.ultradiff偏好设置设置为False。
更改默认文本比较工具

提供该工具的路径：

PREFS SET fiddler.config.path.differ "C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe"

配置命令行以符合该工具的期望：

PREFS SET fiddler.differ.Params "/diff \"{0}\" \"{1}\""