PHP模拟POSTaspx页面不成功,该怎么解决

PHP模拟POST aspx页面不成功
下面实例返回 是 0|访问限制！请重新加载页面
应该放回 -2|车牌号码错误


/************************************************************************
Name: POST 测试程序 Vesion: 1.0 Date: 2004-08-05
*************************************************************************/
$keyimg=$_POST['keyimg'];
if($keyimg){
????$flag = 0;
???? //要post的数据
????$argv = array(
????????'action'=>'Illagel',
????????'back4'=>'3248',
????????'headno'=>'粤',
????????'no'=>'LA9532',
????????'type'=>'02',
????????'validate'=>$keyimg????
????????);
????//构造要post的字符串
????foreach ($argv as $key=>$value) {
????????if ($flag!=0) {
????????????$params .= "&";
????????????$flag = 1;
????????}
????????$params.= $key."=";
????????$params.= urlencode($value);
????????//$params.= $value;
????????$flag = 1;
????}
????echo $params;
????$length = strlen($params);
???? //创建socket连接
????$fp = fsockopen("www.gdhzcgs.com",80,$errno,$errstr,10) or exit($errstr."--->".$errno);
????//构造post请求的头
????//$header = "POST /Illegal.aspx HTTP/1.1\r\n";
????$header = "POST /Ajax.aspx HTTP/1.1\r\n";
????$header .= "Host:www.gdhzcgs.com\r\n";
????$header .= "Referer:www.gdhzcgs.com/Illegal.aspx\r\n";
????$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
????$header .= "Content-Length: ".$length."\r\n";
????$header .= "Connection: Close\r\n\r\n";
????//添加post的字符串
????$header .= $params."\r\n";
????//发送post的数据
????fputs($fp,$header);
????$inheader = 1;
????while (!feof($fp)) {
????????$line = fgets($fp,1024); //去除请求包的头只显示页面的返回数据
????????if ($inheader && ($line == "\n" || $line == "\r\n")) {
???????????? $inheader = 0;
????????}
????????if ($inheader == 0) {
????????????echo $line;
????????}
????}
????fclose($fp);
}
else{
echo 'keyimg=空';
}
?>

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------解决方案--------------------
Request Headers Value
(Request-Line) POST /Ajax.aspx HTTP/1.1
x-requested-with XMLHttpRequest
Accept-Language zh-CN
Referer http://www.gdhzcgs.com/Illegal.aspx
Accept */*
Content-Type application/x-www-form-urlencoded
Accept-Encoding gzip, deflate
User-Agent Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
Host www.gdhzcgs.com
Content-Length 69
Connection Keep-Alive
Cache-Control no-cache
Cookie ASP.NET_SessionId=rimtcb55pc2gcgurkaimgi45; CNZZDATA3614737=cnzz_eid=42940778-1343020353-&ntime=1343020353&cnzz_a=0&retime=1343020354714&sin=<ime=1343020354714&rtime=0

有Cookie呀..