go mod download does not fallback to http if https is not available

[graywolf]

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

$ go version
go version go1.13.5 linux/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/wolf/.cache/go-build"
GOENV="/home/wolf/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/wolf/go"
GOPRIVATE=""
GOPROXY="direct"
GOROOT="/usr/lib/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/tmp/foo/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build915742668=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Given source code:

+   $ tree .
.
├── aaa.go
└── go.mod

0 directories, 2 files
+   $ cat aaa.go
package foo

import (
        "127.0.0.1/foo/bar"
)
+   $ cat go.mod
module xxx

go 1.13

require 127.0.0.1/foo/bar v0.0.0

use sequence of commands:

+   $ nc -l 127.0.0.1 80 &
+   $ go mod download 127.0.0.1/foo/bar

What did you expect to see?

To see some output from netcat.

What did you see instead?

+   $ go mod download 127.0.0.1/foo/bar
go: 127.0.0.1/foo/bar@v0.0.0: unrecognized import path "127.0.0.1/foo/bar" (https fetch: Get https://127.0.0.1/foo/bar?go-get=1: dial tcp 127.0.0.1:443: connect: connection refused)

[mvdan]

I think this might be a case of the XY problem. Why are you trying to use HTTP? Why are you trying to download a module from 127.0.0.1?

[graywolf]

I'm trying to explore if this suggestion https://groups.google.com/d/msg/golang-nuts/MCvH-Bivmn8/YKgbyYH2BwAJ is working for my use case or not but having really hard time figuring out how to do it locally.

[mvdan]

You can use a module proxy, like GOPROXY=http://localhost:8080. There are multiple proxy implementations out there, like general purpose ones (athens) as well as more specific ones, like https://godoc.org/github.com/rogpeppe/go-internal/goproxytest for tests.

[bcmills]

As of Go 1.14, you can also set the GOINSECURE environment variable.

(See https://tip.golang.org/cmd/go/#hdr-Environment_variables.)

[graywolf]

Thank you very much. Will download beta build of go 1.14 and explore if it helps me.

[ALTree]

No updates, seems like this was more of a question, closing here.