Retrieving data

MainPage.xaml.cs

public MainPage()
{
  InitializeComponent();

  _customHttpClientHandler = new EtagHttpClientHandler();
  _customHttpClient = new HttpClient(_customHttpClientHandler)
  {
    BaseAddress = new Uri(ApiBaseUrl)
  };

  RefreshDataCommand = new Command(async () => await GetSuperheroes());


  BindingContext = this;

  RefreshDataCommand.Execute(null);
}

public async Task GetSuperheroes()
{
  IsLoading = true;

  try
  {
    var superheroesJson = await _customHttpClient.GetStringAsync("superhero");
    var superheroes = JsonConvert.DeserializeObject<Superhero[]>(superheroesJson);

    Superheroes.Clear();

    foreach (var hero in superheroes)
      Superheroes.Add(hero);
  }
  catch (HttpRequestException ex) when (ex.Message.Contains("304"))
  {
    // Intentionally left blank, 304 response is fine
  }
  finally
  {
    IsLoading = false;
  }
}