/install/configure -- Don't fail if HTTP listen host and port don't change

control.go

@@ -788,12 +788,20 @@ func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	restartHTTP := true
+	if config.BindHost == newSettings.Web.IP && config.BindPort == newSettings.Web.Port {
+		// no need to rebind
+		restartHTTP = false
+	}
+
 	// validate that hosts and ports are bindable
+	if restartHTTP {
 		err = checkPortAvailable(newSettings.Web.IP, newSettings.Web.Port)
 		if err != nil {
 			httpError(w, http.StatusBadRequest, "Impossible to listen on IP:port %s due to %s", net.JoinHostPort(newSettings.Web.IP, strconv.Itoa(newSettings.Web.Port)), err)
 			return
 		}
+	}
 
 	err = checkPacketPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
 	if err != nil {
@@ -820,10 +828,12 @@ func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
 	httpUpdateConfigReloadDNSReturnOK(w, r)
 	// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
 	// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
+	if restartHTTP {
 		go func() {
 			httpServer.Shutdown(context.TODO())
 		}()
 	}
+}
 
 func registerInstallHandlers() {
 	http.HandleFunc("/control/install/get_addresses", preInstall(ensureGET(handleInstallGetAddresses)))