Galin Iliev's blog

Software Architecture & Development

Fiddler–Compare two sessions

I’ve just found very useful feature in Fiddler – comparing two sessions (HTTP request and response). Even more useful – the compare tool can be configured via registry settings:

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.