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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
Session management is particularly useful in a web browser where a user can save all open pages and settings and restore them at a later date or on a different computer (see data portability). To help recover from a system or application crash, pages and settings can also be restored on next run.
The application may interrupt a dialogue, start another dialogue in the same session, and resume the previous dialogue in the same session or in another session. The session layer may also provide explicit support for managing multiple interruptible dialogues over one or more sessions. These dialogues are called activities. Activities can be ...