@BeforeEach void setUp() {
    server1Health.setHealthy(true);
    server2Health.setHealthy(true);

    logger.info("server 1: {}, server 2: {}", server1.httpUri(), server2.httpUri());

    initWithHosts("127.0.0.1:" + server1.httpPort() + ",127.0.0.1:" + server2.httpPort());
  }
This ensures the response is sent after the request is fully read.
zipkin-server/src/test/java/zipkin2/server/internal/elasticsearch/ITElasticsearchHealthCheck.java