blower_upper.go

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
)

func doReq() io.ReadCloser {
	resp, err := http.Get("http://localhost:48567/hello")
	if err != nil {
		fmt.Print(err)
		os.Exit(1)
	}

	return resp.Body
}

func doit() {
	resp := doReq()
	defer resp.Close()

	b := make([]byte, 1024)
	_, err := resp.Read(b)

	if err != nil {
		fmt.Print(err)
	}
}

func main() {

	// Do it once, there's just an error
	doit()

	// Do it a second time (even in a different process), it blows the server up
	doit()

	fmt.Println("Boom.")
}

server.go

package main

import (
	"fmt"
	"github.com/daaku/go.grace/gracehttp"
	"io"
	"net/http"
	"os"
)

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
		fmt.Println("got it")

		f, _ := os.Open("/dev/random")

		// The key is that this doesn't finish before the connection is closed
		io.Copy(w, f)
	})

	gracehttp.Serve(
		&http.Server{Addr: ":48567", Handler: mux})

}