/** 获取客户端IP */

    public static final String getClientIp(HttpServletRequest request) {

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

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)|| "127.0.0.1".equalsIgnoreCase(ip)) {

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

        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)|| "127.0.0.1".equalsIgnoreCase(ip)) {

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

        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)|| "127.0.0.1".equalsIgnoreCase(ip)) {

            ip = request.getHeader("X-Real-IP");

        }

        if (StringUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)|| "127.0.0.1".equalsIgnoreCase(ip)) {

            ip = request.getRemoteAddr();

        }

        if (StringUtils.isBlank(ip) ||"127.0.0.1".equals(ip)|| ip.indexOf(":") > -1) {

            try {

                ip = InetAddress.getLocalHost().getHostAddress();

            } catch (UnknownHostException e) {

                ip = null;

            }

        }

        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割

        if (ip != null && ip.length() > 15) {

            if (ip.indexOf(",") > 0) {

                ip = ip.substring(0, ip.indexOf(","));

            }

        }

        return ip;

    }

server {

        listen   xxxx;

        server_name  127.0.0.1;

        # 静态页面目录

        root      xxxxxxxxxx;

        # 默认首页

        index      login.html;

        proxy_set_header Host  $http_host;

        proxy_set_header X-Real-IP $remote_addr;

        proxy_set_header REMOTE-HOST $remote_addr;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        add_header Access-Control-Allow-Origin *;

        add_header Access-Control-Allow-Methods 'GET,POST';

        add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

        #proxy_cookie_path /* /*;

        client_max_body_size    100m;

        location / {

            proxy_set_header Host  $http_host;

            proxy_set_header X-Real-IP $remote_addr;

            proxy_set_header REMOTE-HOST $remote_addr;

            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_set_header Upgrade $http_upgrade;

            proxy_set_header Connection "upgrade";

            add_header Access-Control-Allow-Origin *;

            add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

            add_header Access-Control-Allow-Methods GET,POST,OPTIONS;

            ......

        }

   }