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net: clean up port parsing #15326

bradfitz opened this issue Apr 15, 2016 · 2 comments


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commented Apr 15, 2016 updated the parsing of port numbers, but now it accepts
stuff starting with a `+' sign, like:

   net.Dial("tcp", "")

Nobody ever told me why that should be allowed, but the CL was submitted anyway. Or I missed it, but I can't find it.

Investigate and ideally fix.

/cc @mikioh @msiebuhr

@bradfitz bradfitz self-assigned this Apr 15, 2016

@bradfitz bradfitz added this to the Go1.7 milestone Apr 15, 2016


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commented Apr 16, 2016

Yes, I will send a followup CL for better consistency. FWIW, unfortunately the following snippet works w/ CGO_ENABLED=1 older versions or GODEBUG=netdns=cgo newer versions.

package main

import "net"

func main() {
    for _, arg := range []string{"", ""} {
        ln, err := net.Listen("tcp", arg)
        if err != nil {

Probably we should make consistent representation on transport service names and literal port numbers in ABNF for Dial/Listen APIs before Go 1.

@bradfitz bradfitz removed this from the Go1.7 milestone May 5, 2016


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commented May 5, 2016

Okay, if +n worked before, we don't need to do anything here. Still weird, but yay compatibility.

@bradfitz bradfitz closed this May 5, 2016

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