GetClientAdress.java

  public enum IPHeaders {
  CLIENT_IP_UNDERSCORE("Client_IP"),
  CLIENT_IP("Client-IP"),
  X_CLIENT_IP("X-Client-IP"),
  X_FORWARDED_FOR("X-Forwarded-For"),
  FORWARDED_FOR("Forwarded-For"),
  VIA("Via"),
  REMOTE_ADDR("Remote-Addr"),
  X_REMOTE_ADDR("X-Remote-Addr"),
  X_CLUSTER_CLIENT_IP("X-Cluster-Client-IP"),
  X_FORWARDED("X-Forwarded"),
  FORWARDED("Forwarded");

  public final String text;

  private IPHeaders(String text)
  {
    this.text = text;
  }

  public String getText()
  {
    return text;
  }
 
};

//And Then 
  
  public String getClientIpAddr(SlingHttpServletRequest request) {
    String ip = "";
    // looks through http headers, case-insensitive
    for (IPHeaders ipHeader : IPHeaders.values()) {
      ip = StringEscapeUtils.escapeHtml4(request.getHeader(ipHeader.getText()));
      if (ip != null) {
        LOGGER.debug(ipHeader.getText() + "=" + ip);
      }
      if (ip != null && ip.length()>0 && !"unknown".equalsIgnoreCase(ip)) {
        return ip;
      }
    }
    // note that if headers aren't set, we could return source of immediate upstream request
    // using request.getRemoteAddr(), but this isn't meaningful for us
    String remoteAddr = request.getRemoteAddr();
    if (remoteAddr != null) {
      LOGGER.debug("getRemoteAddr=" + remoteAddr);
      ip = remoteAddr;
    }
    if (ip == null || ip.length()==0 || "unknown".equalsIgnoreCase(ip)) {
      ip = "0.0.0.0"; // send a dummy value
    }
    return ip;
  }