CODEWITHSUNDEEP
flutterhttphttpshttp-headersconnection
Juthi Sarker Aka
Juthi Sarker Aka

Reputation: 2475

How to fix HttpException: Connection closed before full header was received

I have recently upgraded my flutter version in my app. But when I want to debug the application, it shows me the following error.

Error connecting to the service protocol: HttpException: Connection closed before full header was received, URI = http://127.0.0.1:50795/ws

Is there anyone facing the same issue after upgrading the flutter version? If is there any workaround, please share.

Upvotes: 132

Views: 146450

Answers (21)

mostafa3dmax
mostafa3dmax

Reputation: 1017

I have set proxy in flutter.bat file removing proxy solved this.

Upvotes: 0

nbloqs
nbloqs

Reputation: 3282

No solution unless the Flutter guys fix it.

I'm having it on one machine (Mac OS Mojave) even when connecting physical iOS devices. Of course it happens too with emulated Android devices (no matter which one).

I am also having this problem in a different computer (MacOS Mojave too) with a physical Android device (with a very old Android version: 5.1).

flutter clean does not fix it at all in my case(s).

Upvotes: 18

Robbendebiene
Robbendebiene

Reputation: 4899

The problem can occur on older TLS protocol versions (TLSv1.2). More specifically dart disables TLS renegotiation by default due to security reasons.

To workaround the problem you can:

  • switch from https to http
  • enable TLS renegotiation via allowLegacyUnsafeRenegotiation SecurityContext.defaultContext.allowLegacyUnsafeRenegotiation = true;

Best solution would be to update the web-server's TLS protocol version if you can.

Source: https://github.com/dart-lang/sdk/issues/47841

Upvotes: 2

TestHau
TestHau

Reputation: 83

For those who run flutter clean and errors pops up on all files. Just run flutter pub get, then it will return back to normal states.

Upvotes: 1

Prateek Jain
Prateek Jain

Reputation: 614

Replace https in the image url with http

Image.network(
  imageUrl.replaceAll("https", "http"),
)

Upvotes: 0

Vitaly Zeyenko
Vitaly Zeyenko

Reputation: 167

I've faced the same problem. Actually the problem was in the native code.

You can track the problem for android if you open an your_app/android project from Android Studio and run it.

The same for iOS -> open iOS project in Xcode So after I've fixed it the app run as intended

I hope this help

Upvotes: 0

Nandita Gandhi
Nandita Gandhi

Reputation: 61

Try using Uri.parse(url); Make sure the 'url' you put here is the full url with endpoint.

Upvotes: 0

sonal
sonal

Reputation: 21

I was getting the same issue in POST request while sending the Images as multipart Resolved by using

contentType: MediaType('image', 'jpeg') in the http.MultipartFile

function

e.g

        request.files.add(
              http.MultipartFile(
                'image',
                stream,
                length,
                filename: basename(_image1.path),
                contentType: MediaType('image', 'jpeg'),
              ),
            );

where 'image' is the paramter name.

Don't forget to import 'package:http_parser/http_parser.dart'; for MediaType. Other Mediatype which you can use are

"image/png"
"image/jpg" 
"image/jpeg"

And I am sending this too in Header "Content-Type": "multipart/form-data"

Upvotes: 0

David Kiarie Macharia
David Kiarie Macharia

Reputation: 289

The issue was on the flutter code.the library socket_io_client it seems not to accept builder

OptionBuilder()
        .setTransports(['websocket'])
        .setPath('/messanging')
        // for Flutter or Dart VM

        //.setPath("/messanging")
       // .setExtraHeaders({"Authorization":"Bearer 
        ${datasource.user?.payload?.access_token}"}) // optional
        .build()

worked when i did use the below map method

socket = IO.io("http://10.18.5.212:3000/messanging", <String, dynamic>{
      "transports": ["websocket"],
      "Authorization":
          "Bearer eyJhbGciOiJIUzI1N......"
    }

Upvotes: 1

Dilendra Shahi
Dilendra Shahi

Reputation: 39

You also need to mention your listening port which you define in your file like this final WebSocketChannel channel = IOWebSocketChannel.connect('wss://check.com:6043/');

It has solved my issue

Upvotes: 0

Jagadish Nallappa
Jagadish Nallappa

Reputation: 842

Stopping the running application and clicking on run again worked for me.

Upvotes: 0

Ray Zion
Ray Zion

Reputation: 678

This was my Problem And this worked For me:

PROBLEM
App would crash abruptly out of no where

CAUSE
I was using cached_network_image, When users uploaded heavy photos > 2MB, cache ran out of memory then app crashes. No warning.

SOLUTION
Use FadeInImage.memoryNetwork() or something else like NetworkImage() but not cache_network_image, it only works for less than 2 MB photos
thanks :)

Upvotes: 8

Fabio Pagano
Fabio Pagano

Reputation: 343

In my case (error "HttpException: Connection closed before full header was received") the call was to an https address using Microsoft Internet Information Services as backend, in the SSL settings of the website in IIS i had mistakenly set "Client certificates: Accept" instead of "Client certificates: Ignore", setting "Ignore" solved the problem.

Upvotes: 1

omgoverflow
omgoverflow

Reputation: 19

I got the same error when I using Flutter with http package.

import 'package:http/http.dart' as http;
...
http.Response response =  http.get('url')

This was fine. But when I went to get the response.statusCode, it Error connecting error.

I found that I'm using SSR/v2Ray on my pc. I fix it by setting the proxy on Android Emulator extended controls panel.

Upvotes: 0

Chris
Chris

Reputation: 2044

Like Vitaly says ..

I am also struggling to force this error at all when building through Xcode for iOS and I imagine the same goes for Android with Android studio..

For iOS do flutter build ios --release and then open/run the project in Xcode

For Android do flutter build apk --release and then open/run the project in Android Studio

It seems to be an issue when debugging through flutter ... I will update this answer if I find otherwise but it seems stable with this method

Upvotes: 0

Bosko Popovic
Bosko Popovic

Reputation: 197

I fixed the issue by setting request.persistentConnection = false; (default is true)

Writing this in case someone has the same problem...

Upvotes: 1

Axes Grinds
Axes Grinds

Reputation: 993

I found the solution/work around. For me, it worked on physical device but not on emulator. The simple fix is to use your an emulator of x86 environment rather than x86_64 emulator.

Upvotes: 0

Navin Kumar
Navin Kumar

Reputation: 4027

If you faced this issue on IOS build, follow th below steps

Goto Runner -> editSchema -> Run -> change build configurations to Debug.

if you are in Release mode you will face this issue, while running on android studio.

Upvotes: 0

Vicky Salunkhe
Vicky Salunkhe

Reputation: 11025

The issue is mainly with Android Q.

You can downgrade your android version from Android Q to Android Pie.

which eventually leads to resolve the issue.

Upvotes: 18

Payam Khaninejad
Payam Khaninejad

Reputation: 7996

First turning off your WiFi/Bluetooth.

And run below command:

flutter clean

And then quitting or restarting your emulator.

Upvotes: 15

awaik
awaik

Reputation: 12335

Right now this issue is opened on github https://github.com/flutter/flutter/issues/32587

Temporarily you can solve this issue by switching to physical device instead of emulator How to test android apps in a real device with Android Studio?

Decision found on github (link upward)

I've got a temporary work around, which I can use for now. The exception above is thrown when I run the emulator as a Pixel 3 Android 9.+ Target (Q API). I made up a second emulated device, a Pixel 2 Android 9.0 Target (28 API), and this target works fine.

I'm also noticing that the Pixel 2 target takes up 8.5GB on Disk, while the Pixel 3 target only takes up 1.4GB. It makes me wonder if the Pixel 3 target is missing some important things.

Upvotes: 26

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