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+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;
+; HTTP digest authentication (2617) - ABNF
+;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;;; 1.2 Access Authentication Framework
+auth-scheme    = token
+auth-param     = token "=" ( token | quoted-string )
+
+challenge   = auth-scheme 1*SP 1#auth-param
+
+realm       = "realm" "=" realm-value
+realm-value = quoted-string
+
+;;;; 2 Basic Authentication Scheme
+challenge   = "Basic" realm
+credentials = "Basic" basic-credentials
+
+basic-credentials = base64-user-pass
+base64-user-pass  = token ;<base64 [4] encoding of user-pass, except not limited to 76 char/line>
+user-pass   = userid ":" password
+userid      = *TEXT ;*<TEXT excluding ":">
+password    = *TEXT
+
+;;;; 3.2.1 The WWW-Authenticate Response Header
+challenge        =  "Digest" digest-challenge
+
+digest-challenge  = 1#( realm | [ domain ] | nonce | [ opaque ] |[ stale ] | [ algorithm ] | [ qop-options ] | [auth-param] )
+
+domain            = "domain" "=" <"> URI ( 1*SP URI ) <">
+URI               = absoluteURI | abs_path
+nonce             = "nonce" "=" nonce-value
+nonce-value       = quoted-string
+opaque            = "opaque" "=" quoted-string
+stale             = "stale" "=" ( "true" | "false" )
+algorithm         = "algorithm" "=" ( "MD5" | "MD5-sess" | token )
+qop-options       = "qop" "=" <"> 1#qop-value <">
+qop-value         = "auth" | "auth-int" | token
+
+
+;;;; 3.2.2 The Authorization Request Header
+credentials      = "Digest" digest-response
+digest-response  = 1#( username | realm | nonce | digest-url | response | [ algorithm ] | [cnonce] | [opaque] | [message-qop] | [nonce-count]  | [auth-param] )
+
+username         = "username" "=" username-value
+username-value   = quoted-string
+digest-url       = "url" "=" digest-url-value
+digest-url-value = request-url   ; As specified by HTTP/1.1
+message-qop      = "qop" "=" qop-value
+cnonce           = "cnonce" "=" cnonce-value
+cnonce-value     = nonce-value
+nonce-count      = "nc" "=" nc-value
+nc-value         = 8LHEX
+response         = "response" "=" request-digest
+request-digest   = DQUOTE 32LHEX DQUOTE
+LHEX             = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" | "a" | "b" | "c" | "d" | "e" | "f"
+
+
+;;;; 3.2.3 The Authentication-Info Header
+AuthenticationInfo = "Authentication-Info" ":" auth-info
+auth-info          = 1#(nextnonce | [ message-qop ] | [ response-auth ] | [ cnonce ] | [nonce-count] )
+nextnonce          = "nextnonce" "=" nonce-value
+response-auth      = "rspauth" "=" response-digest
+response-digest    = DQUOTE *LHEX DQUOTE
+