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多项选择题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.

  • B,D

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