Please mention the exact steps that you performed so that we can reproduce this.

steps that I performed（Before to do the flowing step I executed go clean -modcache）:

$ git clone https://github.com/micro/examples.git
$ cd examples/config
$ go mod init config
$ go mod tidy
verifying github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9/go.mod: github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9/go.mod: malformed record data

The pseudo version is wrong, if you visit https://sum.golang.org/lookup/github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9 you'll see:

not found: github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9: invalid pseudo-version: revision is shorter than canonical (65acae22fc9d)

The correct pseudo-version is actually v0.0.0-20190723190241-65acae22fc9d, and you'll see the sum.golang.org lookup for that succeeds.

When I repeat your commands locally using the official Go proxy (proxy.golang.org) instead of goproxy.io, a clearer failure occurs earlier in go mod tidy:

$ go mod tidy
go: finding github.com/micro/go-micro v1.10.0
go: finding google.golang.org/grpc v1.23.1
go: finding github.com/micro/go-plugins v1.3.0
go: downloading google.golang.org/grpc v1.23.1
go: downloading github.com/micro/go-micro v1.10.0
go: downloading github.com/micro/go-plugins v1.3.0
go: extracting google.golang.org/grpc v1.23.1
go: extracting github.com/micro/go-micro v1.10.0
go: extracting github.com/micro/go-plugins v1.3.0
go: github.com/micro/go-plugins@v1.3.0 requires
	k8s.io/api@v0.0.0-20190726022912-69e1bce1dad5 requires
	github.com/gogo/protobuf@v0.0.0-20190410021324-65acae22fc9: invalid pseudo-version: revision is shorter than canonical (65acae22fc9d)

The error message here you saw isn't ideal because goproxy.io isn't validating pseudo-versions like proxy.golang.org is.

The invalid pseudo-version has actually been fixed in k8s.io/api already with kubernetes/kubernetes#80732, but that new version has not been picked up by micro/go-plugins. There are actually three separate open issues in micro/go-plugins for this: micro/go-plugins#392, micro/go-plugins#394 and micro/go-plugins#396.

You can work around this by adding a replace directive to the go.mod file:

replace github.com/gogo/protobuf v0.0.0-20190410021324-65acae22fc9 => github.com/gogo/protobuf v0.0.0-20190723190241-65acae22fc9d

@tmthrgd, thanks for investigating!

One final note: it appears that the malformed record data error observed by @DingKingTim is due to goproxy.io serving the sumdb URLs with the wrong HTTP status (200 instead of something else).

$ curl -sIL https://sum.golang.org/lookup/github.com/gogo/protobuf@v0.0.0-20190410021324-65ac
ae22fc9 | grep '^HTTP'
HTTP/2 410

$ curl -sIL https://goproxy.io/sumdb/sum.golang.org/lookup/github.com/gogo/protobuf@v0.0.0-20
190410021324-65acae22fc9 | grep '^HTTP'
HTTP/2 200

CC @oiooj

The fix for this diagnostic seems to belong in goproxy.io rather than the go command, so I don't think there is anything more to be done on the Go project side — closing.

goproxy.io fixed this issue, thanks.