無料のland.toで
require_once "HTTP/Request.php";
したのですが

Warning: require_once(HTTP/Request.php) [function.require-once]: failed to open stream: No such file or directory in /home1/httpd/ventz/public_html/http.php on line 2

Fatal error: require_once() [function.require]: Failed opening required 'HTTP/Request.php' (include_path='.:/usr/local/lib/php') in /home1/httpd/ventz/public_html/http.php on line 2

となりました。どうしたら使えるんでしょうか？？