HttpRequest for POST with file

gistfile1.php

<?php
$file_path = '/home/siddharthsaha/Desktop/production.html';
$data = array(
    'owner' => 'siddharth saha'
);
$request = new HttpRequest($url, HttpRequest::METH_POST);
$request->addPostFields($data); # Adding the data with the POST method
$request->addPostFile('test_file', $file_path); # The file has to be posted with a separate method.

$request->send();
if ($request->getResponseCode() == 200) {
    $response = json_decode($request->getResponseBody());
}
?>