一个标准的HTTP请求实例
GET /ga.js HTTP/1.1\r\n
Host: www.google-analytics.com\r\n
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)\r\n
Accept: */*\r\n
Accept-Language: en-us,en;q=0.5\r\n
Accept-Encoding: gzip,deflate\r\n
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n
Keep-Alive: 300\r\n
Connection: keep-alive\r\n
Referer: http://stackoverflow.com/\r\n
If-Modified-Since: Mon, 31 Aug 2009 17:13:58 GMT\r\n
\r\n
\r\n
