• {Buffer}

    Returns the TLS session data or undefined if no session was negotiated. On the client, the data can be provided to the session option of [tls.connect()][] to resume the connection. On the server, it may be useful for debugging.

    See [Session Resumption][] for more information.

    Note: getSession() works only for TLSv1.2 and below. For TLSv1.3, applications must use the ['session'][] event (it also works for TLSv1.2 and below).