When you look at the API for that class, what does it say it will pass to your servlet's doGet or doPost methods?
Doesn't that tell you what you will have to work with?
I think, though, the others were trying to get you to think about the broad differences between the ServletRequest and HttpServletRequest types. If you had to hazard a guess, what would be the number one biggest difference?
Hint: Don't think too hard about it. It's looking at you right in the face