net/http: redirect should requires Location header

[yywing]

When get a http response with status 302 and no Location Header

1. call redirectBehavior get shouldRedirect true https://github.com/golang/go/blob/master/src/net/http/client.go#L738
2. build next request ,and check Location Header https://github.com/golang/go/blob/master/src/net/http/client.go#L645
3. call CheckRedirect

It should be:

1. call redirectBehavior get shouldRedirect true
2. call CheckRedirect
3. build next request ,and check Location Header https://github.com/golang/go/blob/master/src/net/http/client.go#L645

[mengzhuo]

Please fulfill the Go issue template, thanks.

[mengzhuo]

After reading the xray#1493 I think the title should be
redirect should requires Location header

And keeping same logic with 307/308

if resp.Header.Get("Location") == "" {
		shouldRedirect = false
}

Kindly cc @neild for comfirm

[seankhliao]

related #49281

[mengzhuo]

Thanks.
Duplicated with #49281