Web Designer application : request parameter lost after login

Hello,

I have simple web application in web designer with a start and a session module.

I have configured it to use Windows authentication (Ad based). I added it in CAM.

I call the we application from outside like this :  https://CAM_URL/WEB_APP?param=value

Then i 'm routed to login using cloud access manager portal..but the request param is lost..

How can i pass it and have it after login in the url ?

Thank you

Best regards.