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