test.php

<?php

$url = 'https://api.github.com/repos/MattRead/conquistador/git/blobs/82c300571af3a69609466e51c3f057c75cc1df09';
$opts = array(
                'http'=>array(
                        'method'=>"GET",
                        'header'=>"Accept-language: en\r\n" .
                        "User-Agent:    Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6\r\n".
                        "Cookie: foo=bar\r\n"
                )
        );
        $context = stream_context_create($opts);
if ( fopen( $url, "r", false, $context ) != true ) {
echo "bad";
}
else echo "good";