apollo-core/src/main/java/com/ctrip/framework/foundation/internals/provider/DefaultNetworkProvider.java/DefaultNetworkProvider/getProperty
class DefaultNetworkProvider:  @Override
  public String getProperty(String name, String defaultValue) {
    if ("host.address".equalsIgnoreCase(name)) {
      String val = getHostAddress();
      return val == null ? defaultValue : val;
    }
    if ("host.name".equalsIgnoreCase(name)) {
      String val = getHostName();
      return val == null ? defaultValue : val;
    }
    return defaultValue;
  }