BlazorStart/Start/Client/Program.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components.WebAssembly.Authentication;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Blazored.LocalStorage;

namespace Start.Client {
	public class Program {
		public static async Task Main(string[] args) {
			var builder = WebAssemblyHostBuilder.CreateDefault(args);
			builder.RootComponents.Add<App>("#app");

			builder.Services.AddHttpClient("Start.ServerAPI",
					client => client.BaseAddress = new Uri(builder.HostEnvironment.BaseAddress))
				.AddHttpMessageHandler<BaseAddressAuthorizationMessageHandler>();

			// Supply HttpClient instances that include access tokens when making requests to the server project
			builder.Services.AddScoped(sp => sp.GetRequiredService<IHttpClientFactory>()
				.CreateClient("Start.ServerAPI"));

			builder.Services.AddApiAuthorization();

			builder.Services.AddBlazoredLocalStorage();

			await builder.Build().RunAsync();
		}
	}
}