HTML Post to aspx form

POST http://99.99.99.99/Test.aspx HTTP/1.1 Host: 99.99.99.99 Connection: keep-alive Content-Length: 1022 Cache-Control: max-age=0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Origin: https://demo.payment.net User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 postbackXML=%3Cparams+PartnerCD%3D%225233%22+OrderID%3D%226048673%22+Timestamp%3D%222014-07-11+19%3A14%3A51.533%22+StatusCD%3D%226%22+StatusName%3D%22Approved+-+PCB%22+ChannelCD%3D%222%22+ChannelName%3D%22WEB%22+OfficeCD%3D%220%22+OfficeName%3D%22All+Offices%22+UserNumber%3D%220%22+UserName%3D%22PnPDBUser%22+PmtDeviceType%3D%22Visa%22+PmtDeviceLast4%3D%221111%22+FirstName%3D%22test%22+LastName ...