No filter program 340 receive program control as {HEAD ~ request} 325 bypasses {TAIL ~ any filter program} 340 
No filter program 340 receive program control as { HEAD ~ request } 325 bypasses { TAIL ~ any filter program } 340
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH