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net/http: tls verify error message make confused. #42662

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@xiekeyi98

Description

@xiekeyi98

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

$ go version
go version go1.15.5 linux/amd64

Does this issue reproduce with the latest release?

yep.

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

ubuntu@VM-0-6-ubuntu:~$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/ubuntu/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/ubuntu/go"
GORACE=""
GOROOT="/usr/lib/go-1.10"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.10/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
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-build235759783=/tmp/go-build -gno-record-gcc-switches"

What did you do?

Run this golang program:

package main

import (
        "bytes"
        "encoding/json"

        "fmt"
        "io/ioutil"
        "net/http"
//      "crypto/tls"

        "time"
)

func PostJSONWithTimeout(
        urlString string,
        req interface{},
        timeout time.Duration,
) (body []byte, err error) {

        buffer := new(bytes.Buffer)
        json.NewEncoder(buffer).Encode(req)



        client := http.Client{
                Timeout: timeout,
                Transport: &http.Transport{
                        //TLSClientConfig:   &tls.Config{InsecureSkipVerify: true},
                        DisableKeepAlives: true},
        }
        resp, err := client.Post(urlString, "application/json", buffer)

        if err != nil {
                fmt.Printf("err:%v", err)
                return nil, err
        }

        defer resp.Body.Close()

        body, err = ioutil.ReadAll(resp.Body)
        if err != nil {
                fmt.Printf("error:%s", err.Error())
        } else {
                fmt.Printf("suc %s\n", string(body))
        }
        return body, nil
}

func main() {

        req := map[string]string{
                "appkey":        "",
                "encryptsecret": "",
                "firmacctid":    "tt",
        }

        PostJSONWithTimeout("https://firmacct.html5.qq.com/oauth2/get_sig", req, time.Hour)

}

Get Error :

ubuntu@VM-0-6-ubuntu:~$ ~/go/bin/go version && ~/go/bin/go run ./main2.go 
go version go1.15.5 linux/amd64
err:Post "https://firmacct.html5.qq.com/oauth2/get_sig": dial tcp: lookup firmacct.html5.qq.com: too many open files
ubuntu@VM-0-6-ubuntu:~$ ^C

But when I use the go 1.10.4

ubuntu@VM-0-6-ubuntu:~$ go version && go run ./main2.go 
go version go1.10.4 linux/amd64
suc {"ErrCode":-1004,"ErrMsg":"http postbody param empty","Sig":""}

Question

I am confused that why the error message is so strange?

I think he may have something to do with site credentials, but why is the error message so confusing?

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