@Override
    public final void onRequest(ByteBuffer buffer) throws IOException {
        if (mIsSpec) {
            onSpecRequest(buffer);
        } else {
            super.onRequest(buffer);
        }
    }
Notify virtual gateway that no longer has data sent to the client.
netbare-core/src/main/java/com/github/megatronking/netbare/gateway/SpecVirtualGateway.java