本文解析了一个典型的HTTP请求头信息，详细解释了User-Agent、Host等字段的作用及其对于服务器的意义，并介绍了如何通过这些信息进行客户端识别及资源定位。
^([^:]+):(.*)$
'$1' => '$2' ,
User-Agent: Dalvik/2.1.0 (Linux; U; Android 5.1; MX5 Build/LMY47I)
Host: xxx.xxx.xxx
Connection: Keep-Alive
Accept-Encoding: gzip
Content-Type: application/x-www-form-urlencoded
Content-Length: 121
==》替换为
'User-Agent' => ' Dalvik/2.1.0 (Linux; U; Android 5.1; MX5 Build/LMY47I)' ,
'Host' => ' cooperation.html5.qq.com' ,
'Connection' => ' Keep-Alive' ,
'Accept-Encoding' => ' gzip' ,
'Content-Type' => ' application/x-www-form-urlencoded' ,
'Content-Length' => ' 121' ,
'$1' => '$2' ,
User-Agent: Dalvik/2.1.0 (Linux; U; Android 5.1; MX5 Build/LMY47I)
Host: xxx.xxx.xxx
Connection: Keep-Alive
Accept-Encoding: gzip
Content-Type: application/x-www-form-urlencoded
Content-Length: 121
==》替换为
'User-Agent' => ' Dalvik/2.1.0 (Linux; U; Android 5.1; MX5 Build/LMY47I)' ,
'Host' => ' cooperation.html5.qq.com' ,
'Connection' => ' Keep-Alive' ,
'Accept-Encoding' => ' gzip' ,
'Content-Type' => ' application/x-www-form-urlencoded' ,
'Content-Length' => ' 121' ,
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