Request request = new Request.Builder()
	.url("https://tls13.1d.pw") // You can try another TLS 1.3 capable HTTPS server
	.build();

okHttpClient.newCall(request)
	.enqueue(new Callback() {
		@Override
		public void onFailure(final Call call, IOException e) {
			e.printStackTrace();
			Log.d(LOG, "onFailure()");
		}

		@Override
		public void onResponse(Call call,final Response response) throws IOException {
			Log.d(LOG, "onResponse() tlsVersion=" + response.handshake().tlsVersion());
			Log.d(LOG, "onResponse() cipherSuite=" + response.handshake().cipherSuite().toString());
			// D/TestApp##: onResponse() tlsVersion=TLS_1_3
			// D/TestApp##: onResponse() cipherSuite=TLS_AES_256_GCM_SHA384
		}
	});