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OAuth: Setup session manager
A session manager is used to by HTTPS server to store information about clients' HTTP sessions. TElHTTPCustomSessionManager declares an interface for session managers. In your application, you can either use TElHTTPMemorySessionManager implementation of in-memory session information storage, or implement your own descendant of TElHTTPCustomSessionManager class to keep sessions in a database, file system, etc.
An instance of a session manager class should be assigned to TElHTTPSServer.SessionManager property before the first client is accepted by a server.