A highly scalable, flexible, and extensible mechanism is provided for authenticating {TAIL ~ a request} from {HEAD ~ a client} 
A highly scalable , flexible , and extensible mechanism is provided for authenticating { TAIL ~ a request } from { HEAD ~ a client }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD