Closing wss connections might not work as expected

[Davidiusdadi]

Communication via wss in general works fine by now.

Unfortunately closing wss connections is implemented in a very basic way:

public void close() throws IOException {
        sslEngine.closeOutbound();
        sslEngine.getSession().invalidate();
        if( sc.isOpen() )
            sc.write( wrap( emptybuffer ) );
        sc.close();
    }

It is possible that sc.write will not send enough bytes ( i measured 37 bytes ) at once to complete the TLS close notify. Calling sc.write in a loop might block the current thread indefinitely so that is not an option.

As a result your peer host might complain about an unexpectedly closed connection after HE initiated the websocket close handshake.

It will take me a few days to implement the close handshaking the nonblocking way.

Please excuse my humble English.

[marci4]

Code changed with #488.

Closing issue!
Greetings
marci4