Xamarin Forms HttpClient PostAsync always throw NSMallocException

user_2074633 0
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We are building a mobile app for iOS and Android using Xamarin Forms 5 and using Visual Studio 2022. When we make a Post request to any api, both our own as external api's we are always returned:

Xamarin.PreBuilt.iOS[3728:2199180] Xamarin.iOS: Received unhandled ObjectiveC exception: NSMallocException Failed to grow buffer

GET request work fine. I have searched Google and StackOverflow but can not find any help. I have tried to increase the HttpClient.MaxResponseContentBufferSize without any difference.

The app for now is very simple, one page with a button to test. Code behind is as followed:

public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private async void Button_Clicked(object sender, EventArgs e)
        {
            var client = new HttpClient();
            client.BaseAddress = new Uri("https://ptsv2.com/");

            string jsonData = @"{}";

            var content = new StringContent(jsonData, Encoding.UTF8, "application/json");
            HttpResponseMessage response = await client.PostAsync("/t/l4x2e-1637576441/post", content);

            var result = await response.Content.ReadAsStringAsync();
        }
    }

This fails on iOS linked device, but for Android Simulator it works. Is there anything I need to change for iOS?

Update

The code works on multiple machines except mine, trying to figure out what setting this could be, any ideas would be greatly appreciated.

xamarin.forms httpclient ios
1 Answers

I've had exactly the same problem, and have logged a ticket with Microsoft on the VS feedback forums. And then today I found a simple work-around. At least I assume it's a work-around and not a solution. Where I had

HttpClient client = new HttpClient()

I instead do this:

var handler = new HttpClientHandler();
HttpClient client = new HttpClient(handler);

And bingo, it now works.

user_36842480
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