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Fixed in 2019.3

Fixed in 2019.1, 2019.2



Found in





Issue ID




[iOS] UnityWebRequest test fails sending large data



To reproduce:
1. Open user attached project ""
2. Open "SmapleScene.unity" scene
3. Enter Play mode
4. Observe in the Game window as all tests are passing ( it should cycle 5 times )
5. Build for iOS
6. Deploy the Xcode project to an iOS device

Expected result: all the test are passing as in the Editor
Actual result: tests start to fail almost instantly

Reproduced on:
2019.1.4f1 2019.1.8f1 2019.2.0b7 2019.3.0a7

Doesn't reproduce on:
2018.4.3f1 2019.1.3f1

Devices reproduced on:
- iPhone 8 Plus iOS 12.0
- iPhone XR iOS 12.0

Device not reproduced on:
- VLNQA00263, Google Pixel 3 (Pixel 3), Android 9, CPU: Snapdragon 845, GPU: Adreno (TM) 630
- macOS 10.14 machine

- In 2019.3.0a7 on Editor tests fail on the last tests because of a timeout, changing line 32 in "NetworkTester.cs" script from WaitForSeconds(20.0f); to 30.0f all the tests pass

Comments (27)

  1. 4ba73c55dadab1931d3f8388c30a9b34?d=mm


    Jun 27, 2019 06:14

    Fix it please! Thats a big problem for us

  2. 25616df50c478868a0ef9ccc02748476?d=mm


    Jun 25, 2019 16:11

    @RCAMDUELL Thank you, you're a life saver!

  3. 4f69d240746bb729eadb84aa4435a58d?d=mm


    Jun 25, 2019 16:08

    I found that the method "- (void)writeMoreBody" in Classes/Unity/ is being called on the same instance from multiple threads when the issue happens. I added @synchronized (self) {<method body>} and it seems to have worked without any obvious performance issues. I assume this method was developed to be thread safe, but something broke that.

  4. B08fa1bd61727fa0fe4b26d3ccadbb3e?d=mm


    Jun 25, 2019 15:36

    This is also affecting our release. Please address this quickly.

  5. 7cc4d427bc8b0bb580ab236d6d20fc4f?d=mm


    Jun 25, 2019 12:46

    This will block any app dealing with a backend. Corrupts the messages - and could result in corruption of save data. Please fix ASAP!

  6. D130d7e638e5133b3884e026ed79ba86?d=mm


    Jun 25, 2019 12:41

    We have the same issue. Our JSON data that is sent through https is corrupted. Players are losing progress because of this.

  7. 25616df50c478868a0ef9ccc02748476?d=mm


    Jun 25, 2019 10:56

    This is currently blocking our release. Please fix it ASAP.

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