net/http requests seem to ignore Host headers?

[toranger]

What version of Go are you using (go version)?

go1.8.1 linux/amd64

What did you do?

net/http requests seem to ignore Host headers?
`package main

import "os"
import "net/http"

func main() {
req, _ := http.NewRequest("GET", "http://1.2.3.4", nil)
// I wish explicitly setting this Host header would take precedence
req.Header.Set("Host", "www.example.org")
req.Write(os.Stdout)
}
`

What did you expect to see?

I want to send to the stable nginx host, but not change the host header which different from the nginx host.

What did you see instead?

Example output:
GET / HTTP/1.1
Host: 1.2.3.4
User-Agent: Go http package
Before I go further, am I doing this correctly?

[agnivade]

Set the Host field in https://golang.org/pkg/net/http/#Request to override the host value in the URL.

[Gnouc]

Host header is ignored by Request.Write

go/src/net/http/request.go

Line 92 in cad6d1f

// Headers that Request.Write handles itself and should be skipped.

[toranger]

Set the Host field in https://golang.org/pkg/net/http/#Request to override the host value in the URL.

Set the Host field in https://golang.org/pkg/net/http/#Request to override the host value in the URL.
The scene is that I want to send the request with the s3 bucket host such like "BucketName.s3.amazonaws.com" , and send this message to the server which has nginx front which set the location such like "location ~ ^(/test/)(.*)$ ".
I can change the host header by your way, but can not send to the special program on server

[bradfitz]

What @agnivade said:

https://play.golang.org/p/4W_KJGBa77s

It works.