The method 1, wherein processing {HEAD ~ the request} via {TAIL ~ the application} specified by the request on behalf of the client device comprises the application extender to perform one of the following operations: 
The method 1 , wherein processing { HEAD ~ the request } via { TAIL ~ the application } specified by the request on behalf of the client device comprises the application extender to perform one of the following operations :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH