使用过程中的问题和经验，供大家参考

[DanielZhao1990]

1. redis如果是无密码,配置文件必须将密码字段不能使用空字符串字段，会导致redis无法连接。

2. 想要使用ip作为key，就会比较麻烦。customKeyFunction只能获取当前实例的方法且必须方法名称与传入参数一致，对于多种不同参数请求，就比较麻烦了。最后使用了keys = "T(hy.jtt808.ratelimit.RequestUtils).getClientIP()"
   `
   public class RequestUtils {

   public static String getClientIP() {
   ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
   if (attributes == null) {
   return "UNKNOWN";
   }

    HttpServletRequest request = attributes.getRequest();
    String ip = request.getHeader("X-Forwarded-For");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
    }
    return ip;
   

   }
   }
   `