Nginx反向代理后如何获取客户端真实IP

proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;

/**
     * 获取客户端ip
     *
     * @param request
     * @return
     */
    public static String getRemoteAddr(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            int index = ip.indexOf(",");
            return index != -1 ? ip.substring(0, index) : ip;
        } else {
            ip = request.getHeader("X-Real-IP");
            return StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip) ? ip : request.getRemoteAddr();
        }
    }