private ConscryptSession provideAfterHandshakeSession() {
        return (state < STATE_HANDSHAKE_STARTED)
            ? SSLNullSession.getNullSession()
            : provideSession();
    }
Method acts as described in spec for superclass.
@see java.io.OutputStream#write(byte[],int,int)
common/src/main/java/org/conscrypt/ConscryptFileDescriptorSocket.java