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