How to put session on my android after loging-in to my web application

Hi,guys I need some help please I have web application.,I created client side for android that sends data to my web application.,In normal way without using session in my web application my android application can save data to the webpage,but when I put session on my web page for security reason.my android application cannot send the data because my web app will redirect me to the index of my webpage because my android has no session...I am still new in android and I need your help how can I solved this problem.

More inputs will be greatly appreciated.

Thank you in advance.