xxmp 0 Light Poster

i have a page with this code

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:f="http://xmlns.jcp.org/jsf/core">
    <h:head>
        <title>Facelet Title</title>

    </h:head>
    <h:body>
        <h:outputText value="#{pros.handleIpn(request)}"/>
    </h:body>
</html>

and althought i can access this page throught internet ip:8084/path to the page when i insert this page to paypal ipn simulator it does not working. It says Please enter a valid URL. What i am doing wrong? paypal ipng is the only way that i can update my database when a new reservation is made right?
Thank you