The Cache Control header and {HEAD ~ its operation} are explained in paragraphs 12.8 and 13 of {TAIL ~ the RFC} 2326 
The Cache Control header and { HEAD ~ its operation } are explained in paragraphs 12.8 and 13 of { TAIL ~ the RFC } 2326
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH