The protect string specifies {HEAD ~ the authentication scheme} or {TAIL ~ schemes} that need to be implemented for that request 
The protect string specifies { HEAD ~ the authentication scheme } or { TAIL ~ schemes } that need to be implemented for that request
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH