What potential issue could arise from the use of the "Connection: close\r\n" header in the provided PHP code for posting back to the PayPal system?

The potential issue that could arise from using the "Connection: close\r\n" header in the provided PHP code is that it may prematurely close the connection before the response from the PayPal system is fully received. This could result in incomplete data being sent or received, leading to errors in the transaction process. To solve this issue, the "Connection: close\r\n" header should be removed or replaced with a different header that does not prematurely close the connection. 

// Fix for premature connection closure issue
$headers = array(
    "Content-Type: application/x-www-form-urlencoded",
    "Host: www.paypal.com"
);

// Send POST request to PayPal system
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

if($response === false){
    echo 'cURL error: ' . curl_error($ch);
}

curl_close($ch);

Keywords

Connection close header PHP code posting PayPal system

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