<Ul> <Li> A status line which includes the status code and reason message ( e.g. , HTTP / 1.1 200 OK , which indicates that the client 's request succeeded ) . </Li> <Li> Response header fields ( e.g. , Content - Type : text / html ) . </Li> <Li> An empty line . </Li> <Li> An optional message body . </Li> </Ul>
the first line of http request message is called -- -- -- --
A status line