How To: Modify an existing request in Fiddler

Summary

Sometimes an application makes a request a certain way, and while trying to mimic it, but executing a request from the REST endpoint, it doesn’t run the request quite the same as the application. However the existing request can be re-run in Fiddler with a modification.

Procedure

1. Select the request in Fiddler. Right-click the request and click Replay > Reissue and Edit.
2. A new line appears for the reissued request. Make the modification necessary, such as in the web forms.
3. Choose Run to Completion.
4. Use Fiddler to send a request repeatedly, applying pressure to the service.
5. Capture a request using Fiddler.
6. Select the request, right-click, and click Replay > Reissue Requests (Or just click and type R).
7. Select multiple requests and do the same steps.
8. The same request can be run many times using this method.