<?PHP

$ch = curl_init();

$data = array('name' => 'Foo','file' => '@/home/user/test.png');

curl_setopt($ch,CURLOPT_URL,'http://localhost:8000/'); /* Node app*/
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch,CURLOPT_POSTFIELDS,$data);

curl_exec($ch);
?>

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http://php.net/manual/en/function.curl-setopt.php