@Override
        protected void configure(ServerBuilder sb) throws Exception {
            sb.service(PATH, (ctx, req) -> {
                final CompletableFuture<HttpResponse> f = new CompletableFuture<>();
                responses.add(f);
                return HttpResponse.of(f);
            });
            sb.http2MaxStreamsPerConnection(1);
            sb.maxNumConnections(MAX_NUM_CONNECTIONS);
            sb.idleTimeoutMillis(3000);
        }
Makes sure Armeria HTTP client respects {@code MAX_CONCURRENT_STREAMS} HTTP/2 setting.
core/src/test/java/com/linecorp/armeria/client/HttpClientMaxConcurrentStreamTest.java