Servlet API Usage

Servlet API Usage

I am attempting to use the Servlet API to create a request but am having trouble. As a test i put the following into my browser:
 
http://ServiceDesk.examples.com/?username=administrator?password=password?operation=AddRequest?requester=John?requesterEmail=john@mydomain.com?subject=test
 
The response i get is: Failure username cannot be empty
 
I am confused since i did specify the username.
 
Please help