$cookie_session = $logged_user->session_name . '=' . $logged_user->sessid;

// User data
$user_data = array();
$user_data['uid'] = $logged_user->user->uid;
$user_data['data']['name'] = 'test4';

$data = json_encode($user_data);

// cURL code
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://localhost/html/mob/api-    mob/user/".$user_data['uid']);
curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_COOKIE, "$cookie_session"); // use the previously saved session
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($data), mymodule_get_csrf_header())
);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

?q=[my-endpoint]/user/1.json

{
  "uid":"1",
  "name":"bob",
  "mail":"bob@hotmail.com",
  "current_pass":"secret",
  "pass_pass1":"new-secret",
  "pass_pass2":"new-secret"
}