net/http's Shutdown() does not free up the port upon return, or rather it
seems a bit undefined how long it takes for the port to be reusable again.
server := &http.Server{
Addr: fmt.Sprintf(":9000"),
}
go func() {
fmt.Println("hosting...")
err := server.ListenAndServe()
}()
time.Sleep(1 * time.Second)
fmt.Println("closing")
err := server.Shutdown(nil)
fmt.Println("shutdown error", err)
fmt.Println("hosting again...")
err = server.ListenAndServe()
fmt.Println("host again err", err)
The code above, for example, sometimes successfully hosting the http server
twice, but sometimes, the second one fails with "address already in use"
error
$ go run main.go
hosting...
closing
shutdown error <nil>
hosting again...
// This is okay
$ go run main.go
hosting...
closing
shutdown error <nil>
hosting again...
host again err listen tcp :9000: bind: address already in use
My question is, is this a bug, or an expected undetermined behavior? If
it's the latter, how can I safely make sure that Shutdown() completely
frees up the port used?
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