- 401 Unauthorized (code d'état) - Section 3.1
- 407 Proxy Authentication Required (code d'état) - Section 3.2
- champ d'en-tête Authorization - Section 4.2
- URI racine canonique (Canonical Root URI) - Section 2.2
- Grammaire :
- auth-param - Section 2.1
- auth-scheme - Section 2.1
- Authorization - Section 4.2
- challenge - Section 2.1
- credentials - Section 2.1
- Proxy-Authenticate - Section 4.3
- Proxy-Authorization - Section 4.4
- token68 - Section 2.1
- WWW-Authenticate - Section 4.1
- Espace de protection - Section 2.2
- champ d'en-tête Proxy-Authenticate - Section 4.3
- champ d'en-tête Proxy-Authorization - Section 4.4
- Domaine (realm) - Section 2.2
- champ d'en-tête WWW-Authenticate - Section 4.1