[BUG] 集群限流失败，发现客户端ping服务端异常，字符长度过长
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- Java
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Description
## Issue Description
Type: *bug report*
### Describe what happened
具体问题是: 集群限流失败
排查日志发现报错：
客户端心跳ping请求服务端的时候出现字符过长
怀疑是客户端请求的时候，报文decode有点问题
### Describe what you expected to happen
### How to reproduce it (as minimally and precisely as possible)
1. 目前用的sentinel版本1.7.1
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### Tell us your environment
### Anything else we need to know?
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