go 运行部分资源被墙了

https://github.com/goproxy/goproxy.cn/blob/master/README.zh-CN.md
verifying gopkg.in/[email protected]/go.mod: gopkg.in/[email protected]/go.mod: Get https://sum.golang.org/lookup/gopkg.in/[email protected]: dial tcp 172.217.24.17:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
verifying github.com/alecthomas/[email protected]/go.mod: github.com/alecthomas/[email protected]/go.mod: Get https://sum.golang.org/lookup/github.com/alecthomas/[email protected]: dial 
tcp 172.217.24.17:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

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