java-9-http

HttpRequest request = HttpRequest.newBuilder()
                    .uri(new URI("https://postman-echo.com/get"))
                    .version(HttpClient.Version.HTTP_2)
                    .GET()
                    .build();

            HttpResponse<String> response = HttpClient.newHttpClient()
                    .send(request, HttpResponse.BodyHandler.asString());

            assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));