It's in the extended standard library at https://pkg.go.dev/golang.org/x/net/webdav . Whether or not it would meet their needs, they'd have to tell us. I don't think they told us enough to evaluate that ourselves, and even if they did doing even a quick job is probably at least an hour's careful reading and comparing and that's past my budget for an HN post. And they're not obligated to give us an absolutely complete accounting of everything they considered. That just generates other complaints.