Forzar el redireccionamiento de HTTP a HTTPS

En JSP:

<%
if (!request.isSecure()){
	response.sendRedirect("https://"+ request.getServerName() + "/" +  request.getRequestURI());
}
%>

En PHP:

<?php
if($_SERVER["HTTPS"] != "on") {
   header("HTTP/1.1 301 Moved Permanently");
   header("Location: "https://" . $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"]);
   exit();
}
?>

En ASP:

<% 
    if Request.ServerVariables("HTTPS") = "off" then 
        srvname = Request.ServerVariables("SERVER_NAME") 
        scrname = Request.ServerVariables("SCRIPT_NAME") 
        response.redirect("https://" & srvname & scrname) 
    end if 
    'codigo seguro aqui
%>