gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/HBaseZookeeperURLManager.java [63:76]:
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  protected List<String> lookupURLs() {
    // Retrieve list of potential hosts from ZooKeeper
    List<String> hosts = retrieveHosts();

    // Validate access to hosts using cheap ping style operation
    List<String> validatedHosts = validateHosts(hosts,"/version/rest","text/xml");

    // Randomize the hosts list for simple load balancing
    if (!validatedHosts.isEmpty()) {
      Collections.shuffle(validatedHosts);
    }

    return validatedHosts;
  }
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gateway-provider-ha/src/main/java/org/apache/knox/gateway/ha/provider/impl/KafkaZookeeperURLManager.java [67:80]:
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  protected List<String> lookupURLs() {
    // Retrieve list of potential hosts from ZooKeeper
    List<String> hosts = retrieveHosts();

    // Validate access to hosts using cheap ping style operation
    List<String> validatedHosts = validateHosts(hosts,"/topics","application/vnd.kafka.v2+json");

    // Randomize the hosts list for simple load balancing
    if (!validatedHosts.isEmpty()) {
      Collections.shuffle(validatedHosts);
    }

    return validatedHosts;
  }
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