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

$ go version
go version go1.17 darwin/arm64

Does this issue reproduce with the latest release?

yes

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

$ go env
GO111MODULE="on"

GOARCH="arm64"

GOBIN="/Users/tick/go/bin"

GOCACHE="/Users/tick/Library/Caches/go-build"

GOENV="/Users/tick/Library/Application Support/go/env"

GOEXE=""

GOEXPERIMENT=""

GOFLAGS=""

GOHOSTARCH="arm64"

GOHOSTOS="darwin"

GOINSECURE=""

GOMODCACHE="/Users/tick/go/pkg/mod"

GOOS="darwin"

GOPATH="/Users/tick/go"

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/opt/homebrew/Cellar/go/1.17/libexec"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/opt/homebrew/Cellar/go/1.17/libexec/pkg/tool/darwin_arm64"

GOVCS=""

GOVERSION="go1.17"

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 arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/gy/5ff3jzqj6gj5jc38zq91vd2h0000gn/T/go-build1908200583=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

This is my code, please generate your own certificate

package main

import (
    "fmt"
    "net/http"
)

func main() {
    han := func(rw http.ResponseWriter, r *http.Request) {
        _, fh, err := r.FormFile("test")
        if err != nil {
            rw.Write([]byte(fmt.Sprintf("read from file failed, Err: %v", err)))
            return
        }
        rw.Write([]byte(fmt.Sprintf("total %d's byte", fh.Size)))
    }

    s := &http.Server{
        Addr:    ":8080",
        Handler: http.HandlerFunc(han),
    }
    s.ListenAndServeTLS("./server.crt", "./server.key")
}

You can upload a large form using the following command.

curl -k -F 'test=@/path/to/large/file' https://localhost:8080


Note: The file must be large enough to exceed 32M for the following reasons: request form to large will create tmp to save.

What did you expect to see?

At the end of the HTTP request, files in /tmp will be destroyed.

What did you see instead?

Tmp file still exists.