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request.Response.Header.Get(... resulting error nil pointer dereference #40930

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bokunodev opened this issue Aug 20, 2020 · 2 comments
Closed

request.Response.Header.Get(... resulting error nil pointer dereference #40930

bokunodev opened this issue Aug 20, 2020 · 2 comments
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@bokunodev
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bokunodev commented Aug 20, 2020 •
edited

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

$ go version
go version go1.15 linux/arm64

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=""
GOARCH="arm64"
GOBIN="/home/bokuno/go/go/bin"
GOCACHE="/home/bokuno/.cache/go-build"
GOENV="/home/bokuno/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/bokuno/go/workspace/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/bokuno/go/workspace"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,https://index.golang.org,https://gocenter.io,https://athens.azurefd.net,direct"
GOROOT="/home/bokuno/go/go"
GOSUMDB="sum.golang.org"
GOTMPDIR="/tmp"
GOTOOLDIR="/home/bokuno/go/go/pkg/tool/linux_arm64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="0"
GOMOD="/home/bokuno/go/workspace/go-down/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS="-g -O2"
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build066285280=/tmp/go-build -gno-record-gcc-switches"

What did you do?

i tried to access response.Header.Get within function that accept pointer to http.Request as argument.
but, resulting error nil ponter dereference.
where did the pointer go ?
i am new in Go and sorry for my bad english.

if !(ranges && length && response.ContentLength < chunk+1) {
	ch := make(StreamChan, 1)
	name := getName(request.Response.Header.Get(ContentDisposition), // error
		request.URL)
	go downloadSingle(request, ch)
	return name, ch
}

What did you expect to see?

nothing

What did you see instead?

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0x1fa468]

goroutine 1 [running]:
go-down/network.Download(0x4000104c30, 0x4000162000, 0x272393, 0x3, 0xffffff7a86f6)
/home/bokuno/go/workspace/go-down/network/download.go:47 +0x128
main.main()
/home/bokuno/go/workspace/go-down/cmd/main.go:42 +0x124
@bokunodev
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bokunodev commented Sep 30, 2020 •
edited

Hi @foobar1221 I misread the comments. the documentation is clear.

// Response is the redirect response which caused this request
// be created. ___ This field is only populated during client redirects. ___
   Response *Response

go/src/net/http/request.go

Line 311 in 0e85fd7

// to be created. This field is only populated during client

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