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net/http: ReadHeaderTimeout didn't work proper with KeepAlive enabled  #47007

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@molchalin

Description

@molchalin

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

$ go version
$ go version go1.16.5 darwin/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=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/a.eremeev/Library/Caches/go-build"
GOENV="/Users/a.eremeev/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/a.eremeev/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/a.eremeev/go"
GOPRIVATE="stash.mail.ru/scm,gitlab.corp.mail.ru"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/a.eremeev/brew/Cellar/go/1.16.5/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/a.eremeev/brew/Cellar/go/1.16.5/libexec/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16.5"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/0k/19q3g2wx6zlc98ftvxnpq5b80000gp/T/go-build1670355217=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

https://play.golang.org/p/8Za_9D3QqXC

I've sent http request with Keep Alive enabled(IdleConnTimeout = 90s) to server with ReadHeaderTimeout = 3s.

What did you expect to see?

no connection close

What did you see instead?

connection closed after 3s from last request

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