Reproducer for https://github.com/golang/go/issues/53253

go.mod

module github.com/ncw/go-issue-53253

go 1.18

replace golang.org/x/net => /opt/go/x/net

require (
	golang.org/x/net v0.0.0-20220607020251-c690dde0001d // indirect
	golang.org/x/text v0.3.6 // indirect
)

go.sum

golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

main.go

package main

import (
	"flag"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"time"

	"golang.org/x/net/http2"
)

func get(url string) {
	t0 := time.Now()
	resp, err := http.Head(url)
	dt := time.Since(t0)
	if err != nil {
		log.Printf("Failed to fetch %q: %v", url, err)
		return
	}
	defer resp.Body.Close()
	_, err = io.Copy(os.Stdout, resp.Body)
	if err != nil && err != io.EOF {
		log.Printf("Failed to read from %q: %v", url, err)
		return
	}
	fmt.Println()
	log.Printf("%q: read OK", url)
	log.Printf("%q: request -> response took %v", url, dt)
}

func main() {
	flag.Parse()

	// Use the specific version of x/net/http2 in go.mod rather
	// than the one bundled with the go compiler
	t := http.DefaultTransport.(*http.Transport)
	t.TLSNextProto = nil
	err := http2.ConfigureTransport(t)
	if err != nil {
		log.Fatal(err)
	}

	for _, arg := range flag.Args() {
		get(arg)
		get(arg)
		get(arg)
		get(arg)
		get(arg)
	}
}