a) submitting the received request in {TAIL ~ an unmodified form} to the application on behalf of {HEAD ~ the client device} and receiving output from the application responsive to the submitted request 
a ) submitting the received request in { TAIL ~ an unmodified form } to the application on behalf of { HEAD ~ the client device } and receiving output from the application responsive to the submitted request
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH