The present invention provides {TAIL ~ a highly scalable, flexible, and extensible mechanism} for authenticating {HEAD ~ a request} from a client 
The present invention provides { TAIL ~ a highly scalable , flexible , and extensible mechanism } for authenticating { HEAD ~ a request } from a client
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH