code: public static String ipAddress(Request request) {
          String ipAddress = request.header("x-forwarded-for");
          if (StringKit.isBlank(ipAddress) || UNKNOWN_MAGIC.equalsIgnoreCase(ipAddress)) {
              ipAddress = request.header("Proxy-Client-IP");
          }
          if (StringKit.isBlank(ipAddress) || UNKNOWN_MAGIC.equalsIgnoreCase(ipAddress)) {
              ipAddress = request.header("WL-Proxy-Client-IP");
          }
          if (StringKit.isBlank(ipAddress) || UNKNOWN_MAGIC.equalsIgnoreCase(ipAddress)) {
              ipAddress = request.header("X-Real-IP");
          }
          if (StringKit.isBlank(ipAddress) || UNKNOWN_MAGIC.equalsIgnoreCase(ipAddress)) {
              ipAddress = request.header("HTTP_CLIENT_IP");
          }
          if (StringKit.isBlank(ipAddress) || UNKNOWN_MAGIC.equalsIgnoreCase(ipAddress)) {
              ipAddress = request.header("HTTP_X_FORWARDED_FOR");
          }
          return ipAddress;
      }
docs: Get the client IP address by request
  
  @param request Request instance
  @return return ip address