{HEAD ~ Method} and apparatus for implementing {TAIL ~ an extensible authentication mechanism} in a web application server 
for implementing
{ HEAD ~ Method } and apparatus for implementing { TAIL ~ an extensible authentication mechanism } in a web application server
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH