Except if the protocol is not configured as one of the possibilities:
So, for instance, seeing the default config
https://gitlab.cern.ch/dmc/gfal2/blob/develop/dist/etc/gfal2.d/srm_plugin.conf#L26
- srm <=> srm: the same order as appears there
- srm <=> xrootd: the same order as appears there, since xrootd is not on the list
- srm <=> rfio: rfio must be put first
- links to