Is it possible to NOT embed a webapp output ?

Hi,
I use :
response.encodeURL(request.getContextPath()+...
...to encoded my urls in my webapp, and it works fine in jahia.
 
But my webapp is building RTF files :
 
resp.setContentType("application/doc");
resp.addHeader("Content-Disposition", "attachment;filename=export.rtf;");
PrintStream ps = new PrintStream(out);
ps.println("xxxxxxx"); 
 
>> if i encode my URL, i'm loosing the response type in the jahia's request
processing, and the output is printed in the middle of the html template
rendering.
>> if i do not encode my URL, i'm loosing the session
 
so, is it possible to bypass the jahia's request processing ?
 

thanx