@Ivan Thanks for making this point. I took your point and tried to introduce this functionality in Requestly over past couple of days. Have a look at this github issue [0]. But after some research, it looks is is not currently possible to redirect to file:// Urls. But here is a workaround:

1. Upload your local files to dropbox, google drive or any local server
2. Use the URL in the Redirect Rule.

I hope you like Requestly :)

[0]: https://github.com/requestly/chrome-extension/issues/117