[JAVA] request.getRemoteAddr() outputs 0:0:0:0:0:0:0:1 problem

Java source as below 

String ip = request.getHeader("X-Forwarded-For");

Even if you put getHeader, the ip address is 0:0:0:0:0:0:0:1.

0:0:0:0:0:0:0:1 is an IPV6 address, and 127.0.0.1 is correct in IPV4.

The reason is that if you set it up when running Tomcat in Eclipse, it will be imported as IPV6.

    if (ip == null || ip.length() == 0) {

        ip = request.getHeader("Proxy-Client-IP");

    }

    

    if (ip == null || ip.length() == 0) {

        ip = request.getHeader("WL-Proxy-Client-IP");

    }

    

    if (ip == null || ip.length() == 0) {

        ip = request.getHeader("HTTP_CLIENT_IP");

    }

    

    if (ip == null || ip.length() == 0) {

        ip = request.getHeader("HTTP_X_FORWARDED_FOR");

    }

    

    if (ip == null || ip.length() == 0) {

        ip = request.getRemoteAddr();

    } 

😀

Thank you!!

고마워!!