public void setServiceUrl(URI serviceUrl) {
    if (serviceUrl == null || serviceUrl.toString().isEmpty()) {
      this.serviceUrl = null;
      return;
    }
    if (serviceUrl.getUserInfo() != null) {
      String[] ui = serviceUrl.getUserInfo().split(":");
      if (ui.length == 2) {
        auth = BasicToken.ofBasic(ui[0], ui[1]);
      }
    }
    this.serviceUrl = stripBaseUrl(serviceUrl);
  }
The hostName property of this instance of zipkin.
zipkin-server/src/main/java/zipkin2/server/internal/eureka/ZipkinEurekaDiscoveryProperties.java