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User agent
In computing, a user agent is software (a software agent) that is acting on behalf of a user.
For example, an email reader is a mail user agent, and in the Session Initiation Protocol (SIP), the term ''user agent'' refers to both end points of a communications session.〔RFC 3261, ''SIP: Session Initiation Protocol'', IETF, The Internet Society (2002)〕
In many cases, a user agent acts as a client in a network protocol used in communications within a client–server distributed computing system. In particular, the Hypertext Transfer Protocol (HTTP) identifies the client software originating the request, using a "User-Agent" header, even when the client is not operated by a user. The SIP protocol (based on HTTP) followed this usage.
==User agent identification==
When a software agent operates in a network protocol, it often identifies itself, its application type, operating system, software vendor, or software revision, by submitting a characteristic identification string to its operating peer. In HTTP,〔RFC 7231, ''Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content'', IETF, The Internet Society (June 2014)〕 SIP,〔 and NNTP protocols, this identification is transmitted in a header field ''User-Agent''. Bots, such as Web crawlers, often also include a URL and/or e-mail address so that the Webmaster can contact the operator of the bot.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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