PayPal IPN未返回验证为0

我已经要求我的贝宝api发送$res的电子邮件，看看响应是什么。在while内部（！feof（$fp））｛｝

这是我从$res到我的电子邮件得到的

HTTP/1.0 400 Bad Request
Server: BigIP
Connection: close
Content-Length: 19
Invalid Host header

这是我的贝宝代码。

$req = 'cmd=_notify-validate';
$req .= payment_safe_check ($_POST);
$header .= "POST /cgi-bin/webscr HTTP/1.0'r'n";
$header .= "Content-Type: application/x-www-form-urlencoded'r'n";
$header .= "Content-Length: " . strlen($req) . "'r'n'r'n";
$mode = strtolower($paymod_data['PAYMENT_MODE']);
    mail("to email", "subject",serialize($_POST) );

if ($mode == 'test')
{
    $fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
}
else
{
    $fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
}
if (!$fp)
{
    // HTTP ERROR
    die ("Error");
}
else 
{
    // NO HTTP ERROR
    fputs ( $fp, $header . $req );
    while (!feof($fp))
    {
        $res = fgets ($fp, 1024);
        if (strcmp ($res, "VERIFIED") == 0)
        {
            processing ( $_POST );
        }
        else if (strcmp ($res, "INVALID") == 0)
        {
        }
    }
    fclose ($fp);
}

if (strcmp ($res, "VERIFIED") == 0){}不起作用，但如果我将其更改为if (strcmp ($res, "VERIFIED") == -1){}，它就可以正常工作。

更新

我已将代码更改为

$mode = $paymod_data['PAYMENT_MODE'];
$paypal_url = ($mode == 'test') ? 'www.sandbox.paypal.com' : 'www.paypal.com';
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$myPost = array();
foreach ($raw_post_array as $keyval)
{
  $keyval = explode ('=', $keyval);
  if (count($keyval) == 2)
     $myPost[$keyval[0]] = urldecode($keyval[1]);
}
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
$req .= payment_safe_check ($_REQUEST);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://'.$paypal_url.'/cgi-bin/webscr');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Host: '.$paypal_url));
$res = curl_exec($ch);
curl_close($ch);

if (strcmp ($res, "VERIFIED") == 0) {
    processing ( $_POST );
}
else if (strcmp ($res, "INVALID") == 0) {
    // log for manual investigation
}

有人能确认他们是否对此代码有任何问题吗。