@Setup
    public void start() throws Exception {
        server = Server.builder()
                       .https(0)
                       .service("/empty", (ctx, req) -> HttpResponse.of("\"\""))
                       .tlsSelfSigned()
                       .build();
        server.start().join();
        client = newClient();
    }
The {@link SimpleBenchmarkBase} contains the shared logic for benchmarking retrofit2.
benchmarks/jmh/src/jmh/java/com/linecorp/armeria/retrofit2/shared/SimpleBenchmarkBase.java