Http error in background task Windows 10 mobile (UWP)

debugcn Published at Dev

Cabuxa.Mapache

I have a background task which executes a http request, but only works a small number of times. The error returned is: "The server name or address could not be resolved". The url is correct and works fine if I execute it from main app.

The code is a simple http request with a "HttpClient":

public async void Run(IBackgroundTaskInstance taskInstance)
{
    _deferral = taskInstance.GetDeferral();

    try
    {
        using (var client = new HttpClient()) 
        {
            var c = await client.GetStringAsync("http://www.google.com");
        }

    }
    catch (Exception e)
    {

    }
    finally
    {
        _deferral.Complete();
    }
}

As I've said, the same url Works sometimes and sometimes not, and yes, I'm checking internet connection before each request. Any ideas please?

EDITED: Here is my phone info:

And here is the repo with a test app demonstrating the issue: https://github.com/CabuxaMapache/BackgroundTask.Test

EDITED 2: I've tested the app in a Lumia 640 with the same results, over 100 executions and only 10 of them OK. Here is the L640 info:

Thanks in advance

Cabuxa.Mapache

So, finally, the answer is here: https://docs.microsoft.com/en-us/uwp/api/Windows.ApplicationModel.Background.BackgroundTaskBuilder#properties_, thanks Dave Smits!

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edited at2021-07-30

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