Please answer these questions before submitting your issue. Thanks!

What did you do?

https://play.golang.org/p/HvJuH020rlN

I was setting the Server.WriteTimeout to 1 second while I set the handler to run for 10 seconds to simulate long running load. Then execute client to access the server.

What did you expect to see?

I was expecting the client would return after 1 second, because I thought Server.WriteTimeout is used to limit client connection duration, like mentioned in here: https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts#servertimeouts.

What did you see instead?

The client return after 10 seconds. This means even after Server.WriteTimeout is exceeded, the client connection still holds up until handler return the response (though the response would not be retrieved by client, since it is counted as error).

Is this the expected behavior? If so, what is the usage of Server.WriteTimeout actually?

Or perhaps I'm just using it wrong?

Related issues: #24461, #21389 => both of them just discussing about the behavior of ResponseWriter.Write() but not related to overall duration of the request.

Thanks

System details

go version go1.12.4 darwin/amd64
GOARCH="amd64"
GOBIN="/Users/riandyrn/go/bin"
GOCACHE="/Users/riandyrn/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/riandyrn/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.4/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.4/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
GOROOT/bin/go version: go version go1.12.4 darwin/amd64
GOROOT/bin/go tool compile -V: compile version go1.12.4
uname -v: Darwin Kernel Version 16.5.0: Fri Mar  3 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64
ProductName:	Mac OS X
ProductVersion:	10.12.4
BuildVersion:	16E195
lldb --version: lldb-370.0.42
  Swift-3.1