GET steam api forbidden

Steamworks Documentation:
https://partner.steamgames.com/doc/webapi/ISteamApps

my key is right!

my php code:

    $url = "https://partner.steam-api.com/ISteamApps/GetAppBetas/v1/?key=054D365267CC44311C81934617D9E463&appid=730";
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
    $output = curl_exec($ch);
    echo $output;