nReturn in SSLInfo indicates the success of the closure
ISSL_Close() makes one attempt to send the close notify alert to the
Closure in SSL tends to differ in practice from the documented standard.
The standard requires a complete exchange of close alerts. In practice
the secure closure is achieved by the exchange of protocol messages that
are part of the protocol secured, not SSL. This is true of HTTP.
Basically it is not that important for complete closure, thus the
implementation here simply attempts to send the close notify and not the
full close handshake.
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