Isolate hangs when responding to large json

Open

#2,443 opened on Sep 16, 2025 3 comments 2 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: dart, flutter
Domain: mobile-dev, networking

Research direction

Start by reproducing the Dio request on Android with a large JSON response, locking and unlocking the screen, then inspect the default adapter's isolate behavior after the device is lost. Compare the result with Dart's official http library; done means the request returns the configured receive timeout instead of hanging.

Written by the indexing model from the issue text.

Description

h: need triage s: bug

Package

dio

Version

5.8.0+1

Operating-System

Android

Adapter

Default Dio

Output of `flutter doctor -v`

Flutter (Channel stable, 3.35.1, on macOS 15.5 24F74 darwin-arm64, locale zh-Hans-MO) [337ms]
    • Flutter version 3.35.1 on channel stable at /Users/xxx/fvm/versions/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 20f8274939 (5 weeks ago), 2025-08-14 10:53:09 -0700
    • Engine revision 1e9a811bf8
    • Dart version 3.9.0
    • DevTools version 2.48.0
    • Feature flags: no-enable-web, no-enable-linux-desktop, no-enable-macos-desktop, no-enable-windows-desktop, enable-android, enable-ios, cli-animations, enable-lldb-debugging

Dart Version

3.9.0

Steps to Reproduce

1.open app
2.Mobile lock screen
3.Wait a moment,Unlock screen,send a dio request with response body size Larger, The specific threshold is unclear ,and response type is json,content-type is json
4.this dio request no result，

Expected Result

over the receiveTimeount should be return

I found ,the lock screen caused "Lost Device",then back app use isolate will hang.
I don't have this problem when I use the official dart http library

Actual Result

No results

Dominant language: Dart
Stars: 12.8k
Forks: 1.6k
PR merge metrics: No merged PRs in 30d

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