This issue seems to be a question about how to use Go, rather than a feature request or defect report about the Go language and/or toolchain.

We have decided that our experiment to allow questions on the issue tracker has not had the outcome we desired, so I am closing this issue. I'm sorry that we can't answer your question here.

There are many other methods to get help if you're still looking for answers:

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• The Go Forum, a web-based forum hosted by GoBridge.

• The Gophers Slack hosted by GopherAcademy; use the invite app for access.
  The #general channel is a good starting point.

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• IRC channel #go-nuts on Freenode

Thanks

That said, you may want to investigate http://index.golang.org as a starting point.

(CC @katiehockman @julieqiu)

That said, you may want to investigate http://index.golang.org as a starting point.

(CC @katiehockman @julieqiu)
Thank you for your kind reply!
Yes, but I have tried this index api https://index.golang.org/index#, it seems I can only get package publishing records after April 10 2019, so I may want a full list of all package id and their versions; Besides, there are a lot of old packages that have no dependency files, I also want an api to get all dependency information, e.g. we can get mod file from https://proxy.golang.org/<module>/@v/<semver>.mod, but for packages that don't have a mod file, it will return an empty mod file, so I was wondering if there is any API to get dependency information for old packages.
Thanks again for your help!