{HEAD ~ A cache device} may be configured to disallow {TAIL ~ the transmission} of expired content, and to contact the streaming server 100 in order to receive updated content 
configured to disallow
{ HEAD ~ A cache device } may be configured to disallow { TAIL ~ the transmission } of expired content , and to contact the streaming server 100 in order to receive updated content
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH