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Social login allows a user to use existing user credentials from a social networking service to sign in to or create an account on a new website. When access is no longer needed, the user can log out ( log off, sign out or sign off ). Contents 1 Procedure 2 History and etymology 3 See also 4 References Procedure

This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP.

This parameter indicates that the server expects the client to use UTF-8 for encoding username and password (see below). Client side [ edit] When the user agent wants to send authentication credentials to the server, it may use the Authorization header field. The Authorization header field is constructed as follows: [9]

Multi-factor authentication (MFA; encompassing authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism: knowledge (something only the user knows), possession (something only the user has ...

A higher level nonstandard code created by Microsoft. 250: Requested file action okay, completed. 257 "PATHNAME" created. 300 Series: The command has been accepted, but the requested action is on hold, pending receipt of further information. 331: User name okay, need password. 332: Need account for login. 350: Requested file action pending ...