Java Socket POST request header, which is used to spell out the request string through socket

Ost/sys/login. aspx HTTP/1.1
HOST: www.vckbase.com
User-Agent: Mozilla/5.0 (windows; U; Windows NT 5.1; ZH-CN; RV: 1.9) Gecko/2008052906 Firefox/3.0
Accept: text/html, application/XHTML + XML, application/XML; q = 0.9, */*; q = 0.8
Accept-language: ZH-CN, ZH; q = 0.5
Accept-encoding: gzip, deflate
Accept-charset: gb2312, UTF-8; q = 0.7, *; q = 0.7
Keep-alive: 300
Connection: keep-alive
Referer: http://www.vckbase.com/
COOKIE: Maid = dommilabjopanjpnnakamcpk
Content-Type: Application/X-WWW-form-urlencoded
Content-Length: 79

Userid = aaaaaaa & Password = 01234567890 & gclsid = 501 & imagefield3.x = 43 & imagefield3.y = 11

 

It is important to note that there must be an empty line indicating that the request header ends. Otherwise, the server cannot determine whether the request header ends or not, leading to disconnection.
In addition, note that the Data Length value after Content-Length must be correct, that is, the length of the obtained data body part in bytes, this is the data corresponding to userid = aaaaaaa & Password = 01234567890 & gclsid = 501 & imagefield3.x = 43 & imagefield3.y = 11.