The invention is directed to a method of transmitting a file having an advertising portion and {HEAD ~ a requested portion} different from {TAIL ~ the advertising portion} 
The invention is directed to a method of transmitting a file having an advertising portion and { HEAD ~ a requested portion } different from { TAIL ~ the advertising portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL