A Strange Problem With Ruby China Gem Sources

Today, I get a strange question for gem,the ruby package manager.I try to use sudo gem update --system and sudo gem update to update my loacl package.But it seems not work well.

How to fix it?

I try to change the gem source url as https://rubygems.org,and the question is has be gone…….

I don’t know what the fuck with ruby china gem source mirrors.But I think use the defaults config with network proxy is the best way.