HTTP_HOST 和 SERVER_NAME 的区别
hosthttpnamephpserverreservethe differencevariableandof
PHP的SERVER保留变量中HTTP_HOST 和 SERVER_NAME经常是一样的，原因是服务器端口是80，那么HTTP_HOST将省略不显示，而HTTP服务的默认端口就是80，所以大多数情况下，HTTP_HOST都没有显示这个端口号。而如果使用的是ssl链接，那么端口号将被显示出来。 所以HTTP_HOST = SERVER_NAME:SERVER_PORT
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