update example on how to handle headers

http.modules.md

@@ -38,9 +38,11 @@ Modules can change the `req` request and `res` response objects, for instance th
 function onRequest(req, res) {
     res.Status      = 200;
     res.ContentType = "text/html";
-    res.Body        =  readFile("caplets/www/index.html");
-    for (var i = 0; i < res.Headers.length; i++) {
-        res.RemoveHeader(res.Headers[i].Name);
+    res.Body        = readFile("caplets/www/index.html");
+    headers         = res.Headers.split("\r\n")
+    for (var i = 0; i < headers.length; i++) {
+        header_name = headers[i].replace(/:.*/, "")
+        res.RemoveHeader(header_name);
     }
     res.SetHeader("Connection", "close");
 }