docs: public static String getProxyIp(HttpServletRequest request) {
  		String proxyIp = request.getHeader("X-Real-IP");
  		if (proxyIp == null) {
  			proxyIp = request.getHeader("RealIP");
  		}
  		if (proxyIp == null) {
  			proxyIp = request.getRemoteAddr();
  		}
  		return proxyIp;
  	}