多选题Upon a user’s first visit to the website， which two operations are always performed when the getSession method is called with no arguments in a servlet？（）AAll URLs returned by the server are rewritten.BAn HttpSession object is created if necessary.CThe
题目
多选题
Upon a user’s first visit to the website， which two operations are always performed when the getSession method is called with no arguments in a servlet？（）
A
All URLs returned by the server are rewritten.
B
An HttpSession object is created if necessary.
C
The user name and password of the user are checked.
D
The session ID is stored in the HTTP response as a cookie.