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