httpclient-demo

try
{
    using HttpResponseMessage response = await client.GetAsync("https://dummyjson.com/products?limit=20");

    string responseBody = await response.Content.ReadAsStringAsync();

    GetProductsResponse obj = Newtonsoft.Json.JsonConvert.DeserializeObject< GetProductsResponse>(responseBody);

    ProductsCollection.ItemsSource = obj.Products;
}
catch(HttpRequestException ex)
{
    await Shell.Current.DisplayAlert($"Error {(int)(ex.StatusCode ?? System.Net.HttpStatusCode.OK)}", ex.Message, "Oh snap!");
}
catch (Exception ex)
{
    await Shell.Current.DisplayAlert($"Unknown Error", ex.Message, "Oh snap!");
}