编辑“︁HTTP 301”︁（章节）

==定义==
根据定义： <ref name="h1">{{cite web|last1=T.|first1=Fielding, Roy|last2=Tim|first2=Berners-Lee,|last3=Henrik|first3=Frystyk,|title=Hypertext Transfer Protocol -- HTTP/1.0|url=https://tools.ietf.org/html/rfc1945#section-9.3|language=en|accessdate=2017-07-04|archive-date=2010-11-30|archive-url=https://web.archive.org/web/20101130120327/http://tools.ietf.org/html/rfc1945#section-9.3|dead-url=no}}</ref><ref name="h1.1">{{cite web|last1=C.|first1=Mogul, Jeffrey|last2=Jim|first2=Gettys,|last3=Tim|first3=Berners-Lee,|last4=Henrik|first4=Frystyk,|title=Hypertext Transfer Protocol -- HTTP/1.1|url=https://tools.ietf.org/html/rfc2068#section-10.3.2|website=IETF|language=en|accessdate=2017-07-04|archive-date=2018-06-07|archive-url=https://web.archive.org/web/20180607164335/https://tools.ietf.org/html/rfc2068#section-10.3.2|dead-url=no}}</ref><ref>{{cite web|last1=J.|first1=Leach, Paul|last2=Tim|first2=Berners-Lee,|last3=C.|first3=Mogul, Jeffrey|last4=Larry|first4=Masinter,|last5=T.|first5=Fielding, Roy|last6=James|first6=Gettys,|title=Hypertext Transfer Protocol -- HTTP/1.1|url=https://tools.ietf.org/html/rfc2616#section-10.3.2|language=en|accessdate=2017-07-04|archive-date=2011-03-07|archive-url=https://web.archive.org/web/20110307142107/http://tools.ietf.org/html/rfc2616#section-10.3.2|dead-url=no}}</ref>
* 如果一个客户端有链接编辑能力，其应当把所有的引用链接重定向到新的URL上。
* 这个响应代码是可以被缓存的。<ref>{{cite web|title=How long do browsers cache HTTP 301s?|url=http://stackoverflow.com/questions/9130422/how-long-do-browsers-cache-http-301s|website=StackOverflow|accessdate=2016-01-21|archive-date=2016-01-27|archive-url=https://web.archive.org/web/20160127030845/http://stackoverflow.com/questions/9130422/how-long-do-browsers-cache-http-301s|dead-url=no}}</ref><ref>{{cite web|last1=Mark|first1=Nottingham,|last2=Roy|first2=Fielding,|last3=Julian|first3=Reschke,|title=Hypertext Transfer Protocol (HTTP/1.1): Caching|url=https://tools.ietf.org/html/rfc7234#section-4.2.2|language=en|accessdate=2017-07-04|archive-date=2017-07-07|archive-url=https://web.archive.org/web/20170707155139/https://tools.ietf.org/html//rfc7234#section-4.2.2|dead-url=no}}</ref>
* 除非请求方法是HEAD，否则响应实体应该包含一个小型的超文本，标注一个超链接到新的URL。
* 如果是除了GET和HEAD之外的请求方法，客户端必须在重定向之前询问用户。