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net/http: Client following redirects won't preserve Host header #22233

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@timonwong

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@timonwong

Please answer these questions before submitting your issue. Thanks!

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

go version go1.9.1 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/timonwong/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9.1/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9.1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/kf/f_mg9bgj05v7dwjr_gm95g_w0000gn/T/go-build556164700=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
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"

What did you do?

It seems that #8027 was not resolved in #4800. In #4800, custom headers are copied, however, Host field in http.Request is not preserved even if the Location header is just a relative path, see following Go playground link for example:

https://play.golang.org/p/CG45o1eBz8

What did you expect to see?

>> SUCCESS
>> SUCCESS

What did you see instead?

>> ERROR: Got unexpected response code: 403
>> SUCCESS

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