HttpClient request crashes on a Xamarin Notification Service Extensions iOS

Question

I'm trying to request some data from an API using HttpClient in DidReceiveNotificationRequest method (Xamarin iOS Notification Service Extensions project).

When the GetAsync (HttpClient) the extension just crashes.

Am I doing something wrong?

public override async void DidReceiveNotificationRequest(UNNotificationRequest request, Action<UNNotificationContent> contentHandler)
{
    ...

    using (HttpClient client = new HttpClient())
    {
        await client.GetAsync("https://google.com").ConfigureAwait(false); // crashes here
    }

    ...
}

I also tried to use a NSUrlSessionHandler as the HttpClient handler, but no success.

have you tried catching and logging the exception? – Jason Feb 05 '22 at 01:17 — Jason, Feb 05 '22 at 01:17
Yes, I've tried but no exception was thrown – idenardi Feb 09 '22 at 16:20 — idenardi, Feb 09 '22 at 16:20

score 0 · Answer 1 · answered Feb 06 '22 at 16:18

try use with Uri:

Uri uri = new Uri(string.Format(client.BaseAddress + resource, string.Empty));
HttpResponseMessage responseMessage = await client.GetAsync(uri);

and for iOS need add to .plist - NSLocalNetworkUsageDescription

maybe need add HttpMessageHandler:

 client = new HttpClient(CreateClientHandler()) { BaseAddress = new Uri($"https://{Address}:5001") };
....

private HttpClientHandler CreateClientHandler()
    {
       return new HttpClientHandler
       {
           ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return true; }
       };
    }

Thanks Denys, I tried your code but no success. I've noticed that if I avoid the async/await and use .Result the code worked. It seems something related to async code. — idenardi, Feb 09 '22 at 16:23

HttpClient request crashes on a Xamarin Notification Service Extensions iOS

1 Answers1