php - Make a curl request to a url having no file extension?

I have following URL

http://www.davesinclairstpeters.com/auto2_inventorylist?i=37647&c=12452&npg=1&ns=50&echo=2

I want to retrieve content of this url using curl but everytime I make this request it is showing me error, as it is not passing required parameters

Below is my code

    $ch = curl_init(); // start CURL
    curl_setopt($ch, CURLOPT_URL, $json_url); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPGET, true);
    curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);      
    $response = curl_exec($ch);