Call Vaadin 7 app via curl problem

Hi!

I have a Vaadin 6 application, which job is to create a PDF file. I call it via curl() in php:

   $ch = curl_init("https://www.domain.com/cpdf/?par1=1&par2=2");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type: multipart/form-data"));
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_HEADER, false);
 
        $res = curl_exec($ch);
        curl_close($ch);

It works fine when the app was in Vaadin 6. Since I updated it to Vaadin 7 it doesn’t work. 

What is the problem? How can I call the Vaadin 7 version via curl()?
 

So what is the result of the call?

Michael Tzukanov: So what is the result of the call?

With Vaadin 6 version: The PDF is generated (Jasper)
With Vaadin 7 version: Nothing happens, it stops.

I think the problem is, that in Vaadin 7 a JavaScript starts the application, and the Curl can"t run it.
This can be find in the FireBug: vaadin.initApplication("cpdf-1213628635",{

Is there solution to this or I have to use the Vaadin 6 to this?