Why goes Golang URL lib always insert '://'?

Question

In an URL, the authority is supposed to be optional, meaning that URLs such as mailto:[email protected] are valid.

In Golang 1.15.2, if using the net/url class to make an URL like above, it does not appear to allow creation of URLs without an authority.

E.g.

package main import ( "fmt" "net/url" ) func main() { var theURL = url.URL{} theURL.Scheme = "mailto" theURL.Path = "[email protected]" fmt.Println(theURL.String()) // should be mailto:[email protected], but is mailto://[email protected] }

Am I missing something here or is this technically a bug?

Definitely suggests it's a bug!

Evert
– Evert

2020-10-28 00:56:50 +00:00
Commented Oct 28, 2020 at 0:56 — Evert
– Evert, Commented Oct 28, 2020 at 0:56

blami · Accepted Answer · 2020-10-28 02:54:01Z

5

Use theURL.Opaque instead of theURL.Path. See https://golang.org/pkg/net/url/#URL

URLs that do not start with a slash after the scheme are interpreted as:
scheme:opaque[?query][#fragment] 

Working code in Go Playground: https://play.golang.org/p/TFATDQu4PHc

edited Oct 28, 2020 at 2:54

answered Oct 28, 2020 at 1:12

blami

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1 Comment

tul Over a year ago

Ah, I can see the logic now. It looks like Path is only useful for schemes where an authority is in use - so a little knowledge of the scheme is needed to know whether to work with Path or Opaque.

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