HttpException: Connection closed while receiving data

[Oleksii-Milkov]

Package

dio

Version

5.1.2

Output of flutter doctor -v

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[✓] Android Studio (version 2022.1)
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• Flutter plugin version 72.1.2
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• Java version OpenJDK Runtime Environment (build 11.0.15+0-b2043.56-8887301)

[✓] Android Studio (version 2022.2)
• Android Studio at /home/oleksii/.local/share/JetBrains/Toolbox/apps/AndroidStudio/ch-0/222.4459.24.2221.9971841
• Flutter plugin version 74.0.2
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[✓] Connected device (3 available)
• sdk gphone64 x86 64 (mobile) • emulator-5554 • android-x64 • Android 13 (API 33) (emulator)
• Linux (desktop) • linux • linux-x64 • Ubuntu 22.04.2 LTS 5.19.0-46-generic
• Chrome (web) • chrome • web-javascript • Google Chrome 113.0.5672.92

[✓] Network resources
• All expected network resources are available.

Dart Version

3.0.3

Steps to Reproduce

1. Send request with ResponseType.stream

final response = await _client.get(
    _someEndpoint,
    options: Options(
    headers: {
        "Content-Type": "application/octet-stream",
        "Cache-Control": "no-cache",
        "Connection": "Keep-Alive",
    },
    responseType: ResponseType.stream,
    ),
);
return response;

2. Receive response, and listen to stream

final someStream = await createStream();
someStream?.data?.stream
    .transform(someUnit8Transformer)
    .transform(const Utf8Decoder())
    .listen((event) async {
        // Do something with data
});

3. Add onError() callback on StreamSubscription (HttpException received only inside onError(), not try-catch)

try {
    final someStream = await createStream();
    someStream?.data?.stream
        .transform(someUnit8Transformer)
        .transform(const Utf8Decoder())
        .listen((event) async {
            // Do something with data
    }).catchError((err) {
        /// After 20 seconds of idle receive _HttpException: Connection closed while receiving data_ here
        print(err);
    });
} catch (err) {
    /// There are no errors
}

4. Wait 20 seconds of stream idle. If data received more often than in 20 seconds- everything works fine
5. Receive HttpException: Connection closed while receiving data

Expected Result

Correct work of stream and receiving all events

Actual Result

After 20 seconds of stream idle, onError() callback throw HttpException: Connection closed while receiving data. If data received more often than in 20 seconds- everything works fine.
Also i can said that i tried to configure dio.options timeouts, but there are no effect.

[Oleksii-Milkov]

Issue was on the server side.

[melyama]

Issue was on the server side.

Hi,
Could you be more specific. What was the problem on the server side if you can remember? I'm facing the same exception. Server seems to respond from logs on its side, but client says the connection was closed before response was received.

[rockeypandit]

#metoo facing same issue from past some days. Can you also mention what is the backend you are using?