Is there any way to expose the base string when a signature fails?

[csev]

To debug problems with LTI Launches it is essential to be able to compare base strings. The different signature values have no information at all. It would be nice to return the base string in event of provider fail. Something like:

[ { message: 'Invalid Signature' , base: "GET&http..."}, false ]

Would be a nice, clean extension.