golang/go

net/http/httptest: httptest on Windows is IPv4-specific

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#29,759 opened on Jan 15, 2019

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NeedsInvestigationOS-Windowshelp wanted

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Description

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

go version go1.11.1 windows/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

windows/amd64

What did you do?

Run a test leveraging net/http/httptest on a host with IPv6 but without IPv4.

To reproduce:

  1. As administrator, run netsh interface ipv4 uninstall
  2. Reboot
  3. Execute an httptest as in https://play.golang.org/p/xlMUEEhgj5s

What did you expect to see?

Test would pass, since the client and server code were both valid, and pass when IPv4 is available.

What did you see instead?

2019/01/15 17:26:59 Get http://[::1]:49679: dial tcp [::1]:49679: failed to find ConnectEx: An address incompatible with the requested protocol was used.

Contributor guide

Research direction
Investigate why httptest.Server creates an IPv6 listener that fails on Windows when IPv4 is disabled. Focus on the listener creation in net/http/httptest/server.go and the Windows networking stack's behavior with dual stack sockets.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoWindowsnetworking
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60