client IP 가져오기

- spring-boot & nginx (nginx에 설정 필요)
https://playdev.tistory.com/3

- nginx + tomcat
https://2bmw3.tistory.com/9



- x-forwarded-for 이용
X-Forwarded-For: client, proxy1, proxy2

https://www.lesstif.com/pages/viewpage.action?pageId=20775886

http://all-record.tistory.com/168

https://code.i-harness.com/ko/q/fcab15

    public String getClientIpAddr(HttpServletRequest request) {
        logger.debug("getClientIpAddr");
     
        String ip = request.getHeader("X-Forwarded-For");
        logger.debug("X-Forwarded-For [{}]", ip);
       
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("Proxy-Client-IP");
            logger.debug("Proxy-Client-IP [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("WL-Proxy-Client-IP");
            logger.debug("WL-Proxy-Client-IP [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            logger.debug("HTTP_X_FORWARDED_FOR [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_X_FORWARDED");
            logger.debug("HTTP_X_FORWARDED [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_X_CLUSTER_CLIENT_IP");
            logger.debug("HTTP_X_CLUSTER_CLIENT_IP [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_CLIENT_IP");
            logger.debug("HTTP_CLIENT_IP [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_FORWARDED_FOR");
            logger.debug("HTTP_FORWARDED_FOR [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_FORWARDED");
            logger.debug("HTTP_FORWARDED [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("HTTP_VIA");
            logger.debug("HTTP_VIA [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getHeader("REMOTE_ADDR");
            logger.debug("REMOTE_ADDR [{}]", ip);
        }
        if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {
            ip = request.getRemoteAddr();
            logger.debug("getRemoteAddr [{}]", ip);
        }
        return ip;
    }