Peter Dunkley writes:
I don't understand (functionally) what the difference between a flow-token in a Path: header and the received parameter is. So I don't understand why a flow-token can't be put in a Path: header when using GRUU.
most likely you are correct, i.e., there is no problem with flow token in path header of register request as long as there is a way to avoid flow token in r-r uris.
-- juha