What are common errors when transferring POST parameters with fsockopen() in PHP?

Common errors when transferring POST parameters with fsockopen() in PHP include not properly formatting the POST data, not setting the Content-Length header correctly, and not sending the POST data after the headers. To solve this issue, make sure to properly format the POST data as a query string, set the Content-Length header to the length of the POST data, and send the POST data after the headers. 

<?php

$host = 'example.com';
$port = 80;
$path = '/path/to/endpoint';

$postData = http_build_query(array(
    'param1' => 'value1',
    'param2' => 'value2'
));

$contentLength = strlen($postData);

$request = "POST $path HTTP/1.1\r\n";
$request .= "Host: $host\r\n";
$request .= "Content-Type: application/x-www-form-urlencoded\r\n";
$request .= "Content-Length: $contentLength\r\n";
$request .= "\r\n";
$request .= $postData;

$fp = fsockopen($host, $port, $errno, $errstr, 30);

if (!$fp) {
    echo "Error: $errstr ($errno)\n";
} else {
    fwrite($fp, $request);
    
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
    
    fclose($fp);
}

?>

Keywords

fsockopen POST parameters PHP errors transferring

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