{HEAD ~ A request} associated with {TAIL ~ one or more network resources} may be received, and a set of one or more tags associated with the request may be identified 
associated with
{ HEAD ~ A request } associated with { TAIL ~ one or more network resources } may be received , and a set of one or more tags associated with the request may be identified
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL 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