HTTP redirect: 301 (permanent) vs. 302 (temporary)
问题 Is the client supposed to behave differently? How? 回答1: Status 301 means that the resource (page) is moved permanently to a new location. The client/browser should not attempt to request the original location but use the new location from now on. Status 302 means that the resource is temporarily located somewhere else, and the client/browser should continue requesting the original url. 回答2: When a search engine spider finds 301 status code in the response header of a webpage, it understands