What is bisocket transport

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The bisocket transport, like the multiplex transport, is a bidirectional transport that can function in the presence of restrictions that would prevent a unidirectional transport like socket or http from creating a server to client push callback connection. (See Section Callbacks for more information about callbacks and bidirectional and unidirectional transports.) For example, security restrictions could prevent the application from opening a ServerSocket on the client, or firewall restrictions could prevent the server from contacting a ServerSocket even if it were possible to create one.