How can the "fatal protocol error" be resolved when using HTTP/1.0 in the header of a POST request to an IIS 5.0 server in PHP?

To resolve the "fatal protocol error" when using HTTP/1.0 in the header of a POST request to an IIS 5.0 server in PHP, you can try setting the "Connection: close" header in your request. This will ensure that the connection is closed after the response is received, preventing the error from occurring. 

<?php

$url = 'http://your-iis-5.0-server.com/endpoint';
$data = array('key1' => 'value1', 'key2' => 'value2');

$options = array(
    'http' => array(
        'header' => "Content-type: application/x-www-form-urlencoded\r\n" .
                    "Connection: close\r\n",
        'method' => 'POST',
        'content' => http_build_query($data)
    )
);

$context = stream_context_create($options);
$response = file_get_contents($url, false, $context);

echo $response;

?>

Keywords

HTTP/1.0 POST request IIS 5.0 PHP fatal protocol error

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