Golang.org is blocked in China, go get -u google.golang.org/grpc failes

[Paul Verest]

On https://grpc.io/docs/quickstart/go.html

there is

$ go get -u google.golang.org/grpc

however golang.org is blocked in China (see https://no-google-in-china.github.io/ ), so the command fails.

There is mirror https://developers.google.cn, but I cannot find gRPC within products https://developers.google.cn/products/

What can be alternative that would work for all developers?