Connection closed while receiving data

[Mythar]

Im getting this a lot when calling my backend Django REST api (localhost).

What i have found on the web is that, this is a problem when using an emulator, and everything works just fine on a "real" device.

Its like the http call (POST, PUT etc.) does not give the host enough time to respond.
I monitor the server responses and the server dose respond correctly but connection gets cut off.

Its very annoying when working in a development environment, i was wondering if any has a solution to this?

[sanmaozhao]

Same issue here.
Real device work fine, bug Andriod emulator fail.

[zoechi]

Please add the output of flutter doctor -v.

[sanmaozhao]

flutter doctor -v
[√] Flutter (Channel beta, v0.11.8, on Microsoft Windows [Version 10.0.17134.407], locale zh-CN)
    • Flutter version 0.11.8 at D:\flutter
    • Framework revision f5b02e3c05 (16 hours ago), 2018-11-20 07:49:29 -0800
    • Engine revision 1baf081343
    • Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)

[√] Android toolchain - develop for Android devices (Android SDK 26.0.2)
    • Android SDK at D:\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 26.0.2
    • ANDROID_HOME = D:\Android\sdk
    • Java binary at: D:\Android\Android Studio 2\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)
    • All Android licenses accepted.

[√] Android Studio (version 3.2)
    • Android Studio at D:\Android\Android Studio 2
    • Flutter plugin version 30.0.1
    • Dart plugin version 181.5656
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)

[!] VS Code, 32-bit edition (version 1.11.2)
    • VS Code at C:\Program Files (x86)\Microsoft VS Code
    • Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

[davewang]

Same issue here.

[aleaforny]

I'm experiencing the same issue while using a Django environment as a backend.
I'm trying to retrieve an image from my Django website (simple GET request), I tried several widgets (NetworkImage, AdvancedNetworkImage, CachedNetworkImage), but I got the exact same error everytime. Nothing wrong on server-side, it returns code 200 OK.

It is important to note that my Django server was located in the same subnet as the emulated device (development environment, in the same private network). This issue does NOT occur while getting images from the "Internet". I finally found a workaround by hosting the images at a different location outside of my network (remote website storage).

Maybe it is also important to note that (in my case), this issue had nothing to do with the image sizes (I got the issue on images from 4 Ko to +10 Mo, but no issues at all when fetching Internet images).

Hope this can be fixed very soon, it will help greatly working in a development environment :)

[Mythar]

My workaround was to use an old PC as server on my private network.
Issue occurs when server and development are on the same IP.

[The-Redhat]

I got the same issue with a real iPone 6s.

[lifetin]

我是安卓的模拟器 也出现同样的问题
换到genymotion正常.

[zhangzhenxi]

I fixed this by remove proxy config for my Android emulator in my case.

https://www.dartlang.org/tools/pub/troubleshoot

[aleaforny]

I fixed this by remove proxy config for my Android emulator in my case.

https://www.dartlang.org/tools/pub/troubleshoot

How did you do, exactly? The link you've provided helps to set up a proxy on the machine, not to remove proxy config for the Android emulator, AFAIK.

The issue is still occuring

Thanks

[zhangzhenxi]

remove proxy config for the Android emulator

[aleaforny]

Thanks @zhangzhenxi !

I guess it did the trick, the issue does not occur every time now.

I assume this is a workaround though ; do we have an ETA on a possible fix release?

Thanks again for your help 👍

[dayofbrian]

I'm also experiencing this issue. Turning off the proxy only makes the issue become random (does not fail every time). My REST API is on another server on the local network. This issue makes it impossible to do any development work.

[aleaforny]

@dayofbrian it's been several months now that I've not faced this issue anymore.

Perhaps it can help you; what version of Android Studio do you use? Same question for the AVD?
On my hand, my AVD is a Pixel 2 API 28 x86, and Android Studio 3.5.3
And I use cached_network_image version 2.0.0-rc.

Turning off the proxy definitely did the trick.

Hope this can help.

[dayofbrian]

I've basically started using my Samsung device to do all development.

Android Studio 3.5.3 looks like 3.6.2 is available now
Also using a Pixel 2 API 28 for the virtual device
No idea how to find the AVD version, I hunted all over for it, but it was part of AS 3.5.3
No idea what the cached_network_image is either.

[raminri]

Also getting this issue with both images & other large downloads. This is making it very difficult to do any local development.

Disabling proxy hasn't fixed the issue for me.

[uzumaki258]

I faced the problem with load multi-image files, but sometimes, maybe problem at my server

[marhyno]

any update on this ? facing same issue on any emulator, but real phone works fine

[whatamelon]

Like above issues, I'm facing this issue with load multiple images too.
In my guess, api server sent to me well, but in my response header is closed before whole images coming.
So, I just want to know. Why header is closing while response is coming.

[darshankawar]

@Mythar
Is still a valid issue using latest Flutter version ?
Thanks.

[adgrover]

I had been encountering the same issues. My use case was that i was running a flask application on the localhost and accessing the REST endpoints through the URL. The workaround I got was exposing my localhost through a tunneling service.

You can consider using ngrok. Of course, your data will be routed through a third-party service but yeah

[pedromassangocode]

Without additional information, we are unfortunately not sure how to resolve this issue.
We are therefore reluctantly going to close this bug for now.
Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!
Thanks for your contribution.

Could everyone who still has this problem please file a new issue with the exact description of what happens, logs, and the output of flutter doctor -v.
All system setups can be slightly different, so it's always better to open new issues and reference related issues.

[godilite]

This issue still occur

[altafkhan8719]

I am also facing the same issue while downloading a large file,
I am using dio: ^3.0.10
HttpException: Connection closed while receiving data,

[AwsmAsim]

I had been encountering the same issues. My use case was that i was running a flask application on the localhost and accessing the REST endpoints through the URL. The workaround I got was exposing my localhost through a tunneling service.

You can consider using ngrok. Of course, your data will be routed through a third-party service but yeah

For Flask backend:
Add from werkzeug.serving import WSGIRequestHandler and
add WSGIRequestHandler.protocol_version = "HTTP/1.1" before: app.run(...)

Also don't forget to remove proxy config for the Android emulator

This is what solved the problem in my case.

[alboto]

I had been encountering the same issues. My use case was that i was running a flask application on the localhost and accessing the REST endpoints through the URL. The workaround I got was exposing my localhost through a tunneling service.
You can consider using ngrok. Of course, your data will be routed through a third-party service but yeah

For Flask backend:
Add from werkzeug.serving import WSGIRequestHandler and
add WSGIRequestHandler.protocol_version = "HTTP/1.1" before: app.run(...)

Also don't forget to remove proxy config for the Android emulator

This is what solved the problem in my case.

It works ! Thanks a lot!

[sgsm74]

same issue for me
backend is laravel

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.