net/http: should Request.Write use Header["Host"] if Request.Host is unset?

[bradfitz]

See:
http://play.golang.org/p/toLUTjj_fE

The Host field is not written, since Request.Write(io.Writer) uses Request.Host, and not
Request.Header.Get("Host").

It's document that Request.Write uses the Host field, and it's listed first:

    http://golang.org/pkg/net/http/#Request.Write

Should Request.Write fall back to Request.Header.Get("Host") if Request.Host
is unset?

[rsc]

Comment 1:

That's probably an API change. I'm inclined to leave it as is.

[bradfitz]

Comment 2:

Fine by me. Added a test to make sure we always do it that way, then:
https://golang.org/cl/7314093

Status changed to Started.

[bradfitz]

Comment 3:

This issue was closed by revision cd56695.

Status changed to Fixed.