private String getJava8EngineWrapperAlpn() throws NoSuchMethodException, IllegalAccessException,
            InvocationTargetException {
        Method getApplicationProtocolMethod = mSSLEngine.getClass().getDeclaredMethod(
                "getApplicationProtocol");
        getApplicationProtocolMethod.setAccessible(true);
        return (String) getApplicationProtocolMethod.invoke(mSSLEngine);
    }
Http SSL codec enables Application-Layer Protocol Negotiation(ALPN).

See http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-04#page-4

@author Megatron King
@since 2019/1/3 23:31
netbare-core/src/main/java/com/github/megatronking/netbare/http/HttpSSLResponseCodec.java