What‘s does ”error closing gzip response writer” mean in log?

I upgrade my cluster from 1.1.4 to 2.0,1.
Then there are a lot of below errors in the log.
“W180521 08:13:39.127079 205975 server/server.go:1761 [n1] error closing gzip response writer: ”
What‘s does ”error closing gzip response writer” mean?

Hello Jason,

This message comes from the standard library http handlers performing gzip compression. This usually indicates a broken connection which makes sense in the case or a rolling upgrade.

Without any other problems, this message is fairly benign. Did you encounter any problems?

@marc Thanks for your reply!There are no any problems. I just want to know it.