Flutter occurs 'Error connecting to the service protocol: HttpException...' error on iOS device

Question

For network connection I use dio and for checking connection state from Connectivity.

And in here I check network state:

@override
 Widget build(BuildContext context) {

 bloc.checkConnectivity(Connectivity());

 return StreamBuilder(
    stream: bloc.getInitApp,
    builder: (context, AsyncSnapshot<InitApp> initApp) {
      if (initApp.hasData) {
        return prepareMain(initApp.data);
      } else {
        return Center(
          child: CircularProgressIndicator(),
        );
      }
    });
}

checkConnectivity method:

checkConnectivity(Connectivity _connectivity) {
 _connectivity.onConnectivityChanged.listen((ConnectivityResult result){
   if (result == ConnectivityResult.mobile ||
       result == ConnectivityResult.wifi) {
       fetchInitApp();
    }
   });
 }

But eventually, App runs just on Android device but on iOS(Device/Simulator) occurs this error :

Error connecting to the service protocol: HttpException: , uri = http://127.0.0.1:1024/ws

I tried to call Api without Connectivity and the app work as good but with it gets data just in Android and for iOS still there is problem .

Too, it happens with Dart http package .

Edit 1: 25 Sep 2019

This has nothing to do with codes!

The problem is the system WiFi connection.

When you faced with this problem use this temporary solution until a complete solution is provided:

Disconnect system WiFi
Unplug your phone
Reconnect your system to WiFi
Plug your phone
Run the application

I have this problem as well. I wonder, do you use Firebase for anything in this app? — Kirby, Jan 05 '19 at 21:34
No @Kirby, just simple `http connection`, I really do have any idea why this is happens, it happens for you on all devices or just on iOS? — Saeid, Jan 06 '19 at 12:09
This error is always happening to me on Samsung Galaxy S10 (API 10) Genimotion's emulator. — SalahAdDin, Sep 08 '21 at 09:26

score 6 · Answer 1 · answered Mar 02 '19 at 01:00

6

Just reconnect your Device with your IDE and restart as well your IDE, after this it will work.

answered Mar 02 '19 at 01:00

Osman

1,496
18
22

dhanasekar · Answer 2 · 2019-08-21T07:26:49.723

3

run flutter clean command- it deletes the previous build. then execute try flutter run command

edited Aug 21 '19 at 07:26

answered Aug 20 '19 at 16:15

dhanasekar

1,228
13
16

score 2 · Answer 3 · answered Sep 13 '19 at 06:35

2

I have the same issue. When it happens, I unplug/plug the iPhone and it starts working.

answered Sep 13 '19 at 06:35

dilip

163
8

score 2 · Answer 4 · edited Dec 27 '19 at 21:19

2

Looks like the Facebook plugin is causing this issue. If you are using it, try disabling it.

edited Dec 27 '19 at 21:19

blurfus

13,485
8
55
61

answered Dec 27 '19 at 20:47

sempernoob

186
2
8

score 1 · Answer 5 · answered Jun 18 '19 at 07:30

1

If you are sharing network from your mac, disable it. it's worked for me.

answered Jun 18 '19 at 07:30

Sreekuttan

1,579
13
19

score 1 · Answer 6 · answered Dec 26 '19 at 19:34

The same issue came across me and I'm using an android studio in windows. The issue was in flutter_facebook_login dependency(using firebase) that I want to use for FB login. The version of this dependency was 3.0.0, So finally I removed this dependency and everything worked fine

score 1 · Answer 7 · answered Apr 04 '20 at 14:48

Any sufficiently old plugin can cause this issue. If you really need the plugin and is has not been recently updated then you can add the folder locally to your project and upgrade the gradle build files. But that's only if you can't find an alternative recently updated plugin. Facebook login plugin fixed this issue in a recent update so the newest facebook login plugins no longer have this fault. As for me, I had to check each of my packages one by one to see which one was causing the issue. This involved opening a new android studio project and only adding the flutter packages and no other code then run the app with adding the plugins 1 by 1 until you find which plugin is at fault. A faster way would be to check each plugin on pub.dev and see which one hasn't been updated in recent months and is using older gradle files.

score 0 · Answer 8 · answered Nov 23 '21 at 07:25

0

The cause was for me a non-null safe plugin:

1.) So I copied it to lib folder

2.)and made it null safe

3.)then removed it from pubspec.yaml

answered Nov 23 '21 at 07:25

Ray Zion

610
10
11

score 0 · Answer 9 · answered Apr 28 '22 at 09:32

0

restarting my phone helped me.

answered Apr 28 '22 at 09:32

Mosayeb Masoumi

481
4
10

shaderone · Answer 10 · 2022-05-06T09:02:17.157

0

If you close your application from the device itself when it is running, you'll get this error the next time you run. [Tested this 3 times & i'm using a physical device - SM J111F(samsung galaxy duos)-android-arm] another cause would be one or more of the plugins that you use

The only thing that worked is to Reload the IDE(vs-code) before running again or restart the physical device.

Earlier i tried many commands and workarounds..flutter clean..flutter pub get, adb kill-server...adb usb...modifying pubspec but nothing worked out for me.

edited May 06 '22 at 09:02

answered May 06 '22 at 08:37

shaderone

408
9
21

**Note :** `flutter_launcher_icons`, `http` may cause this issue – shaderone May 06 '22 at 08:47

score -1 · Answer 11 · answered Mar 24 '21 at 04:57

-1

just upgrade u'r flutter this is work for me

answered Mar 24 '21 at 04:57

Dwi Nur Rohman

425
2
5
13

score -1 · Answer 12 · answered Oct 17 '21 at 11:37

I had similar issue, but only started when I wanted to run the app from the IDE which was running fine from the terminal. Somehow, the error only occurs when I want to run the app from the terminal and the IDE interchangeably. WHAT WORKED FOR ME... I restarted my connected device and ran the app from the terminal and it was fine again. However, the error returned once I wanted to run from the IDE. I restarted my connected device again and ran the app straight from the IDE this time and it worked fine.

loopassembly · Answer 13 · 2021-11-25T09:24:45.560

-1

I was also getting same error and i did the following and it resolved my issue:

Restart your phone/emulator

Reconnect your Device/emulator with your IDE and restart as well your IDE

edited Nov 25 '21 at 09:24

answered Nov 24 '21 at 07:47

loopassembly

2,653
1
15
22

Flutter occurs 'Error connecting to the service protocol: HttpException...' error on iOS device

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