net/http: empty port for ":port" causes it to default to 0

[0xmohit]

1. What version of Go are you using (go version)?
   go version go1.6 linux/amd64
2. What operating system and processor architecture are you using (go env)?
   GOARCH="amd64"
   GOBIN=""
   GOEXE=""
   GOHOSTARCH="amd64"
   GOHOSTOS="linux"
   GOOS="linux"
   GOPATH=""
   GORACE=""
   GOROOT="/usr/local/go"
   GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
   GO15VENDOREXPERIMENT="1"
   CC="gcc"
   GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0"
   CXX="g++"
   CGO_ENABLED="1"
3. What did you do?
   Try https://golang.org/pkg/net/http/#Get with an URL such as https://golang.org:
   Playground link: http://play.golang.org/p/sKElWJHkz- (Won't execute on the playground due to restrictions.)
4. What did you expect to see?
   No error. A response something to this effect:
   2016/03/16 08:00:00 resp: &{GET https://golang.org HTTP/1.1 1 1 map[] <nil> 0 [] false golang.org map[] map[] <nil> map[] <nil> <nil>}
   Quoting from http://tools.ietf.org/html/rfc3986#section-6.2.3, an
   explicit ":port", for which the port is empty or the default for the
   scheme, is equivalent to one where the port and its ":" delimiter are
   elided and thus should be removed by scheme-based normalization.
5. What did you see instead?
   2016/03/16 08:00:00 err: Get https://golang.org:: dial tcp 216.58.196.209:0: i/o timeout exit status 1
   (Note that it's attempting to connect to port 0.)

[odeke-em]

I've taken a stab at this with CL https://go-review.googlesource.com/20903.

[gopherbot]

CL https://golang.org/cl/20903 mentions this issue.

[gopherbot]

CL https://golang.org/cl/22140 mentions this issue.