net/http http2 reverse proxy connection pool

[Rohsichan]

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

$ go version
go version go1.19.13 linux/amd64

Does this issue reproduce with the latest release?

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY="git.monitorapp.com/aioncloud"
GONOSUMDB="git.monitorapp.com/aioncloud"
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE="git.monitorapp.com/aioncloud"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19.13"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/root/wsp/src/AICWF10/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2426452122=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I am is httputil reverse proxy http2 use, client <- h2 -> proxy <- h2 -> server

transport config

   MaxIdleConns:        maxConns.MaxIdleConns,  // 1000
   MaxIdleConnsPerHost: maxConns.MaxIdleConnsPerHost, // 1000 
   IdleConnTimeout:     time.Minute * time.Duration(maxConns.IdleConnTimeout), // 10min

What did you expect to see?

Can't you make the server pool a transaction count in session?

What did you see instead?

I'm using http2. However, proxy <-> server and tcp are slow. A tcp retransmission occurs.
In this situation, only one http2 session is open.
Transaction is all locked. There is one server.
It becomes normal when connecting to the server without going through the proxy.
Can't you make the server pool a transaction count in session?
I checked with the netstat command and only use one tcp session.

[Rohsichan]

Additionally, more than 100 transactions are being processed in one session.

[seankhliao]

it would be up to the client to open up multiple connections, the server has no control over this.

[Rohsichan]

Go reverse proxy http2 is an issue that uses only one server and one tcp connection.
The client is the httputil reverse proxy.