This is a simple way to test CURL just copy to your webserver and run.

curl-test.php

<?php
//Filename: curl_test.php

$ch = curl_init();

curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

//Uncomment this for Windows.
//curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

curl_setopt($ch, CURLOPT_URL, "EMBED YOUR FILE URL HERE ");

$result = curl_exec($ch);

echo '<pre>';
print_r(curl_getinfo($ch));
echo '</pre>';

echo 'Errors: ' . curl_errno($ch) . ' ' . curl_error($ch) . '<br><br>';

curl_close ($ch);

echo $result . 'EOF';
?>