[Blazor][Wasm] Move HttpClient from default services to Program.Main

src/Components/WebAssembly/WebAssembly/src/Hosting/WebAssemblyHostBuilder.cs

@@ -98,15 +98,6 @@ private void InitializeDefaultServices()
             Services.AddSingleton<INavigationInterception>(WebAssemblyNavigationInterception.Instance);
             Services.AddSingleton<ILoggerFactory, WebAssemblyLoggerFactory>();
             Services.TryAdd(ServiceDescriptor.Singleton(typeof(ILogger<>), typeof(WebAssemblyConsoleLogger<>)));
-            Services.AddSingleton<HttpClient>(s =>
-            {
-                // Creating the URI helper needs to wait until the JS Runtime is initialized, so defer it.
-                var navigationManager = s.GetRequiredService<NavigationManager>();
-                return new HttpClient
-                {
-                    BaseAddress = new Uri(navigationManager.BaseUri)
-                };
-            });
         }
     }
 }

src/Components/WebAssembly/WebAssembly/src/Services/HttpClientServiceCollectionExtensions.cs

@@ -0,0 +1,31 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Net.Http;
+using Microsoft.AspNetCore.Components;
+
+namespace Microsoft.Extensions.DependencyInjection
+{
+    public static class HttpClientServiceCollectionExtensions
+    {
+        /// <summary>
+        /// Adds a <see cref="HttpClient" /> instance to the <paramref name="serviceCollection" /> that is
+        /// configured to use the application's base address (<seealso cref="NavigationManager.BaseUri" />).
+        /// </summary>
+        /// <param name="serviceCollection">The <see cref="IServiceCollection" />.</param>
+        /// <returns>The configured <see cref="IServiceCollection" />.</returns>
+        public static IServiceCollection AddBaseAddressHttpClient(this IServiceCollection serviceCollection)
+        {
+             return serviceCollection.AddSingleton(s =>
+            {
+                // Creating the URI helper needs to wait until the JS Runtime is initialized, so defer it.
+                var navigationManager = s.GetRequiredService<NavigationManager>();
+                return new HttpClient
+                {
+                    BaseAddress = new Uri(navigationManager.BaseUri)
+                };
+            });
+        }
+    }
+}

src/Components/WebAssembly/WebAssembly/test/Hosting/WebAssemblyHostBuilderTest.cs

@@ -80,7 +80,6 @@ private static IReadOnlyList<Type> DefaultServiceTypes
                     typeof(NavigationManager),
                     typeof(INavigationInterception),
                     typeof(ILoggerFactory),
-                    typeof(HttpClient),
                     typeof(ILogger<>),
                 };
             }

src/Components/WebAssembly/testassets/StandaloneApp/Program.cs

@@ -3,6 +3,7 @@
 
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace StandaloneApp
 {
@@ -12,6 +13,7 @@ public static async Task Main(string[] args)
         {
             var builder = WebAssemblyHostBuilder.CreateDefault(args);
             builder.RootComponents.Add<App>("app");
+            builder.Services.AddBaseAddressHttpClient();
 
             await builder.Build().RunAsync();
         }

src/Components/test/testassets/BasicTestApp/Program.cs

@@ -34,6 +34,7 @@ public static async Task Main(string[] args)
 
             builder.RootComponents.Add<Index>("root");
 
+            builder.Services.AddBaseAddressHttpClient();
             builder.Services.AddSingleton<AuthenticationStateProvider, ServerAuthenticationStateProvider>();
             builder.Services.AddAuthorizationCore(options =>
             {

src/ProjectTemplates/ComponentsWebAssembly.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Client/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using System.Text;
@@ -18,7 +18,7 @@ public static async Task Main(string[] args)
             var builder = WebAssemblyHostBuilder.CreateDefault(args);
             builder.RootComponents.Add<App>("app");
 
-            // use builder.Services to configure application services.
+            builder.Services.AddBaseAddressHttpClient();
 #if (IndividualLocalAuth)
     #if (Hosted)
             builder.Services.AddApiAuthorization();