RFC du protocole HTTP : Access Authentication


11.0 Access Authentication

   HTTP provides several OPTIONAL challenge-response authentication
   mechanisms which can be used by a server to challenge a client
   request and by a client to provide authentication information. The
   general framework for access authentication, and the specification of
   "basic" and "digest" authentication, are specified in "HTTP
   Authentication: Basic and Digest Access Authentication" [43]. This
   specification adopts the definitions of "challenge" and "credentials"
   from that specification.