net/http: Post url: read tcp xx->xx: i/o timeout returns less than 1 seconds

[jacentsao]

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

$ go version
go version go1.10.3 windows/amd64

Does this issue reproduce with the latest release?

yes

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

$ go env
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\xx\AppData\Local\go-build
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=G:\workspace\GO
set GORACE=
set GOROOT=C:\Go
set GOTMPDIR=
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fno-caret-diagnostics -Qunused-arguments -fmessag                                                                                                                                                                                               e-length=0 -fdebug-prefix-map=C:\Users\xx\AppData\Local\Temp\go-build87870614                                                                                                                                                                                               2=/tmp/go-build -gno-record-gcc-switches

What did you do?

tr = &http.Transport{
	TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	Dial:            TimeoutDialer(connectTimeout, readWriteTimeout),
}
client := &http.Client{Transport: tr,}
if req, err := client.Post(url, "application/json;charset=utf-8", body); err == nil {
    defer req.Body.Close()
   if result, err := ioutil.ReadAll(req.Body); err == nil {
       Post url: read tcp xx->xx: i/o timeout 
  }
}  else {
   
}

What did you expect to see?

no error occurs

What did you see instead?

I got a timeout error just like below when launch post request it returns error less than 1 seconds

Post url: read tcp xx->xx: i/o timeout 

[agnivade]

I think DialContext is a better choice for what you are trying to do.

In any case, we would need a full standalone code sample, rather than a snippet. Also, what is the url ? Is it an internal server ? How do we reproduce this issue ? Have you tried with 1.11 ?

[jacentsao]

@agnivade I add a sample code, but output is different with output my pc local. Here is my local output:

create request failed Post https://web.zhihuiji.com/sync: read tcp 192.168.5.36:56318->118.194.40.71:443: i/o timeoutpanic: Post https://web.zhihuiji.com/sync: read tcp 192.168.5.36:56318->118.194.40.71:443: i/o timeout

But run in play.golang.org:

create request failed Post https://web.zhihuiji.com/sync: dial tcp: Protocol not availablepanic: Post https://web.zhihuiji.com/sync: dial tcp: Protocol not available

After some research i found that i got a transportReadFromServerError like below:

Because of the post method, it won't retry the request though it will be okay when i retry request the same content. Why not retry when the server returns error even it's none-idempotent requests