Http429.SimulateThrottling
This Fiddler extension tampers HTTP response messages to HTTP 429 Too Many Requests errors.
It is written to only process *.sharepoint.com requests, and those end with /_vti_bin/client.svc
Throttling driven by a concurrent queue. 10 requests must occur within 5 seconds for the throttling to kick in.
**You can change any of the above hardcoded values. **
It is hardcoded for Fiddler version 4.6.3.44034, but you can change that to your version (see: https://github.com/OneBitSoftware/Http429.SimulateThrottling/blob/master/Http429.SimulateThrottling/ThrottleSimulatorExtension.cs#L2)
It requires a reference to Fiddler.exe, which is set to "C:\Program Files (x86)\Fiddler2\Fiddler.exe" in the .csproj file, so point that to your Fiddler installation .exe.
Feel free to raise any issues or submit PR's.