Mop up stray Blazor Preview 4 updates (#17910)

Author: guardrex

aspnetcore/blazor/call-web-api.md

@@ -5,7 +5,7 @@ description: Learn how to call a web API from a Blazor WebAssembly app using JSO
 monikerRange: '>= aspnetcore-3.1'
 ms.author: riande
 ms.custom: mvc
-ms.date: 04/16/2020
+ms.date: 04/19/2020
 no-loc: [Blazor, SignalR]
 uid: blazor/call-web-api
 ---
@@ -112,7 +112,11 @@ JSON helper methods send requests to a URI (a web API in the following examples)
   }
   ```
 
-  Calls to `PostAsJsonAsync` return an <xref:System.Net.Http.HttpResponseMessage>.
+  Calls to `PostAsJsonAsync` return an <xref:System.Net.Http.HttpResponseMessage>. To deserialize the JSON content from the response message, use the `ReadFromJsonAsync<T>` extension method:
+  
+  ```csharp
+  var content = response.content.ReadFromJsonAsync<WeatherForecast>();
+  ```
 
 * `PutAsJsonAsync` &ndash; Sends an HTTP PUT request, including JSON-encoded content.
 
@@ -141,7 +145,11 @@ JSON helper methods send requests to a URI (a web API in the following examples)
   }
   ```
 
-  Calls to `PutAsJsonAsync` return an <xref:System.Net.Http.HttpResponseMessage>.
+  Calls to `PutAsJsonAsync` return an <xref:System.Net.Http.HttpResponseMessage>. To deserialize the JSON content from the response message, use the `ReadFromJsonAsync<T>` extension method:
+  
+  ```csharp
+  var content = response.content.ReadFromJsonAsync<WeatherForecast>();
+  ```
 
 <xref:System.Net.Http> includes additional extension methods for sending HTTP requests and receiving HTTP responses. [HttpClient.DeleteAsync](xref:System.Net.Http.HttpClient.DeleteAsync*) is used to send an HTTP DELETE request to a web API.
 

aspnetcore/includes/blazor-security/fetchdata-component.md

@@ -38,7 +38,7 @@ If the request failed because the token couldn't be provisioned without user int
         {
             httpClient.DefaultRequestHeaders.Add("Authorization", 
                 $"Bearer {token.Value}");
-            forecasts = await httpClient.GetJsonAsync<WeatherForecast[]>(
+            forecasts = await httpClient.GetFromJsonAsync<WeatherForecast[]>(
                 "WeatherForecast");
         }
         else

aspnetcore/includes/blazor-security/imports-hosted.razor

@@ -1,4 +1,5 @@
 @using System.Net.Http
+@using System.Net.Http.Json
 @using Microsoft.AspNetCore.Components.Authorization
 @using Microsoft.AspNetCore.Components.Forms
 @using Microsoft.AspNetCore.Components.Routing

aspnetcore/includes/blazor-security/imports-standalone.razor

@@ -1,4 +1,5 @@
 @using System.Net.Http
+@using System.Net.Http.Json
 @using Microsoft.AspNetCore.Components.Authorization
 @using Microsoft.AspNetCore.Components.Forms
 @using Microsoft.AspNetCore.Components.Routing

aspnetcore/security/blazor/webassembly/additional-scenarios.md

@@ -5,7 +5,7 @@ description:
 monikerRange: '>= aspnetcore-3.1'
 ms.author: riande
 ms.custom: mvc
-ms.date: 03/30/2020
+ms.date: 04/19/2020
 no-loc: [Blazor, SignalR]
 uid: security/blazor/webassembly/additional-scenarios
 ---
@@ -134,7 +134,7 @@ The following example shows how to:
         {
             httpClient.DefaultRequestHeaders.Add("Authorization", 
                 $"Bearer {token.Value}");
-            await httpClient.PostJsonAsync("Save", User);
+            await httpClient.PostAsJsonAsync("Save", User);
         }
         else
         {

aspnetcore/security/blazor/webassembly/hosted-with-azure-active-directory.md

@@ -17,8 +17,6 @@ By [Javier Calvarro Nelson](https://github.com/javiercn) and [Luke Latham](https
 
 [!INCLUDE[](~/includes/blazorwasm-3.2-template-article-notice.md)]
 
-
-
 This article describes how to create a [Blazor WebAssembly hosted app](xref:blazor/hosting-models#blazor-webassembly) that uses [Azure Active Directory (AAD)](https://azure.microsoft.com/services/active-directory/) for authentication.
 
 ## Register apps in AAD B2C and create solution

aspnetcore/security/blazor/webassembly/index.md

@@ -5,7 +5,7 @@ description: Learn how to secure Blazor WebAssemlby apps as Single Page Applicat
 monikerRange: '>= aspnetcore-3.1'
 ms.author: riande
 ms.custom: mvc
-ms.date: 03/31/2020
+ms.date: 04/19/2020
 no-loc: [Blazor, SignalR]
 uid: security/blazor/webassembly/index
 ---
@@ -64,7 +64,11 @@ public class Program
         var builder = WebAssemblyHostBuilder.CreateDefault(args);
         builder.RootComponents.Add<App>("app");
 
-        services.AddBaseAddressHttpClient();
+        builder.Services.AddSingleton(new HttpClient 
+        {
+            BaseAddress = new Uri(builder.HostEnvironment.BaseAddress)
+        });
+
         services.Add...;
 
         ConfigureCommonServices(builder.Services);