Disabling the HTTP connection keep-alive may help for this situation by calling: `srv.SetKeepAlivesEnabled(false)` and get the expected output **sometimes**
$ go run a.go
In handler wrapper, f = 0xc4200111a0
1
In handler wrapper, f = 0xc4200111a8
2
Though, it’s strange that you’ll still need to Sleep some time to make sure
the first server is cleaned properly.
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"strconv"
)
// Some state so we can show the old handler is in effect...
type Foo struct {
SomeVar int
}
func (f *Foo) Serve(addr string) (net.Listener, error) {
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("In handler wrapper, f = %p\n", f)
w.Write([]byte(strconv.Itoa(f.SomeVar)))
})
srv := &http.Server{
Handler: mux,
}
srv.SetKeepAlivesEnabled(false)
go srv.Serve(l)
return l, nil
}
func main() {
f1 := &Foo{SomeVar: 1}
f2 := &Foo{SomeVar: 2}
l, err := f1.Serve("0.0.0.0:8090")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Println(doRequest())
l.Close()
// Ok it didn't actually close, wait a bit or it'll show the address as
// already in use...
// time.Sleep(1 * time.Second)
l, err = f2.Serve("0.0.0.0:8090")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Println(doRequest())
l.Close()
}
func doRequest() string {
client := &http.Client{}
req, _ := http.NewRequest("GET", "http://0.0.0.0:8090";, nil)
resp, _ := client.Do(req)
bytes, _ := ioutil.ReadAll(resp.Body)
return string(bytes)
}
> On Apr 18, 2017, at 11:48, Ken Simon <ninke...@gmail.com> wrote:
>
> srv := &http.Server{
> Handler: mux,
> }
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