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x/net/http2: connection reused with DisableKeepAlives #22441

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benburkert opened this issue Oct 25, 2017 · 6 comments
Closed

x/net/http2: connection reused with DisableKeepAlives #22441

benburkert opened this issue Oct 25, 2017 · 6 comments
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FrozenDueToAge WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided.
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Unplanned

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@benburkert
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Please answer these questions before submitting your issue. Thanks!

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

go version go1.9 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/benburkert"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9/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/qs/qkt9twmx4qg379d6f8kxl1vm0000gn/T/go-build568362356=/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?

Send multiple requests to the same h2 server with keep alives disabled.

https://play.golang.org/p/sxjh2Yq-hg

What did you expect to see?

no output because connections are not used across requests.

What did you see instead?

connection reused: "[::1]:61658"
connection reused: "[::1]:61658"
connection reused: "[::1]:61658"
connection reused: "[::1]:61658"
connection reused: "[::1]:61661"
connection reused: "[::1]:61665"
connection reused: "[::1]:61668"
connection reused: "[::1]:61668"
connection reused: "[::1]:61668"
connection reused: "[::1]:61668"
connection reused: "[::1]:61671"
@ianlancetaylor
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CC @tombergan

@ianlancetaylor ianlancetaylor added this to the Go1.10 milestone Oct 25, 2017
@tombergan
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Might be related to #22413

@tombergan
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tombergan commented Oct 27, 2017 •
edited

https://golang.org/cl/33153 was wrong. When keep alives are disabled, we don't start graceful shutdown (i.e., send GOAWAY) until the first request completes. We should actually start graceful shutdown when the first request is received.

@tombergan tombergan self-assigned this Oct 27, 2017
@tombergan
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tombergan commented Oct 27, 2017 •
edited

Actually, this is WAI according to https://golang.org/cl/33153:
https://go-review.googlesource.com/c/net/+/33153/1/http2/server.go#1281

I don't think this gets all the cases. What if the client sends a second request before the first completes?

I think that's fine. It's supposed to be close-ish in behavior. I figure that the user's intention was probably to minimize open connections, closing them as soon as possible. So if their goal is to minimize conns, it's better to support reusing one conn for multiple requests.

@benburkert, what are you trying to achieve by disabling keep alives on HTTP/2? This feature happened in #17717 where Brad was trying to give meaning to SetKeepAlivesEnabled for HTTP/2. In all honesty it's kind of weird for the HTTP/2 library to support this option, since "keep alives" are an HTTP/1 notion that doesn't translate to HTTP/2.

@tombergan tombergan added the WaitingForInfo Issue is not actionable because of missing required information, which needs to be provided. label Oct 30, 2017
@tombergan
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Removing the 1.10 milestone since there is no bug that I can see. I will leave this open in state WaitingForInfo in case @benburkert wants to respond to the above question.

@tombergan tombergan removed this from the Go1.10 milestone Nov 27, 2017
@bradfitz bradfitz added this to the Unplanned milestone Nov 27, 2017
@gopherbot
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Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)

@golang golang locked and limited conversation to collaborators Nov 30, 2018
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@benburkert @bradfitz @ianlancetaylor @gopherbot @tombergan