Refit + Prism Forms + Fusillade + ModernHttpClient

ApiService.cs

using System;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using Fusillade;
using ModernHttpClient;
using Newtonsoft.Json;
using Refit;

/// <summary>
/// Private and Public Variables
/// </summary>
/// <typeparam name="TInterfaceService"></typeparam>
public partial class ApiService<TInterfaceService>
{
    readonly JsonSerializerSettings jsonSerializerSettings;
    readonly Lazy<TInterfaceService> _background;
    readonly Lazy<TInterfaceService> _userInitiated;
    readonly Lazy<TInterfaceService> _speculative;
}

/// <summary>
/// Constructor Creation
/// </summary>
/// <typeparam name="TInterfaceService"></typeparam>
public partial class ApiService<TInterfaceService>
{
    public ApiService()
    {
        jsonSerializerSettings = new JsonSerializerSettings
        {
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
            NullValueHandling = NullValueHandling.Ignore,
            DateTimeZoneHandling = DateTimeZoneHandling.Utc
        };

        _background = new Lazy<TInterfaceService>(() => CreateHttpClient(
            new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.Background)));

        _userInitiated = new Lazy<TInterfaceService>(() => CreateHttpClient(
            new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.UserInitiated)));

        _speculative = new Lazy<TInterfaceService>(() => CreateHttpClient(
            new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.Speculative)));
    }
}

/// <summary>
/// Private Methods
/// </summary>
/// <typeparam name="TInterfaceService"></typeparam>
public partial class ApiService<TInterfaceService>
{
    TInterfaceService CreateHttpClient(HttpMessageHandler messageHandler)
    {
        var client = new HttpClient(messageHandler)
        {
            BaseAddress = new Uri(AppConstants.BaseAddress),
            Timeout = TimeSpan.FromSeconds(AppConstants.Timeout)
        };

        client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
        //client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");
        return RestService.For<TInterfaceService>(client, new RefitSettings
        {
            ContentSerializer = new JsonContentSerializer(jsonSerializerSettings)
        });
    }
}

/// <summary>
/// IApiService<TInterfaceService> Implementation
/// </summary>
/// <typeparam name="TInterfaceService"></typeparam>
public partial class ApiService<TInterfaceService> : IApiService<TInterfaceService>
{
    public TInterfaceService Speculative { get => _speculative.Value; }

    public TInterfaceService UserInitiated { get => _userInitiated.Value; }

    public TInterfaceService Background { get => _background.Value; }
}

Step 1 : - https://gist.github.com/hamid-shaikh/24d93419f9b5313685c4dfc40f4b59dc
Step 2 : - https://gist.github.com/hamid-shaikh/7a766529e79cea8e108d53c657ca1594
Step 3 : - https://gist.github.com/hamid-shaikh/803e88151281e24bc07fba2a4903cc49
Step 4 : - https://gist.github.com/hamid-shaikh/082fea0c0bb3accc7c1db180d81a9884
Step 5 : - https://gist.github.com/hamid-shaikh/0774fe04cf7121c0d596925c93fc1809