显示HTTP状态码和HEAD信息↓
HTTP/1.1 200 OK
Date: Tue, 02 Jul 2024 18:16:12 GMT
Server: Apache/2.4.6 (CentOS) PHP/5.6.40
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Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html; charset=utf-8