Cookies are not added to cookie container when running on iOS

[h-arshad]

When using rest sharp in NET MAUI application development, for the same API call that is supposed to inject a cookie, in Android you will see the cookie but it is missing when running in iOS device.

Code Sample:

async Task TestCookiesAsync(){
var restClient = new RestSharp.RestClient(new RestSharp.RestClientOptions()
{
  BaseUrl = new Uri("https://google.com"),
  CookieContainer = new System.Net.CookieContainer()
});
var request = new RestSharp.RestRequest("", RestSharp.Method.Get);
var response = await restClient.ExecuteAsync(request);
Console.WriteLine(response.Cookies.Count);
}

Expected behaviour:
The response cookie should be added inside the cookie container.

• OS: iOS 17.2.1 (iPhone 11 )
• NET MAUI .NET 8
• Rest Sharp V 110.2.0

[rassilon]

Based on what I see at https://github.com/dotnet/runtime/blob/main/src/libraries/System.Net.Http/src/System/Net/Http/HttpClientHandler.AnyMobile.InvokeNativeHandler.cs

This probably has something to do with the differences between the native handlers on iOS vs Android.
i.e. Xamarin.Android.Net.AndroidMessageHandler, Mono.Android vs System.Net.Http.NSUrlSessionHandler, Microsoft.iOS

If a redirect is involved, it might be related to #2059, although I wonder why the behavior would differ between mobile platforms. :(

[h-arshad]

Thank you for your response and looking into the post.
In fact I do not suspect the issue comes from those handlers because eventually due to the cookie issue I had with Restsharp, I replaced it with the native HttpClient and it works fine on both platforms.
I put an example of the working code below.

private static readonly System.Net.Http.HttpClientHandler HttpClientMessageHandler = new()
 {
     AllowAutoRedirect = false,
     UseCookies = true,
     CookieContainer = new(),
 };
 private static readonly System.Net.Http.HttpClient RestClient = new(HttpClientMessageHandler)
 {
     BaseAddress = new("https://google.com"),
     Timeout = TimeSpan.FromSeconds(60),
     DefaultRequestHeaders =
     {
         { "User-Agent", "mobile"},
         { "Accept", "application/json" }
     }
 };

The one can simply use var response = await RestClient.GetAsync();