When writing code in Go and to be able to use go get 1dev needs to support go-import meta tags when ?go-get=1 is added to repository's URL.

It is supported by Github, Gitlab, Gitea (at least).

To see in action how imports looks like try https://go.dev.pztrn.name/periodicator and take a look at page's source. Also there is a doc on official Golang page: https://golang.org/cmd/go/#hdr-Relative_import_paths