From 5001054eb655e5f424dc791849289a007d1f0877 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 8 Oct 2025 15:55:49 +0000
Subject: [PATCH 1/2] Initial plan


From 0be75490ea40cf2f65e45dadd308fc8bfc6347f4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 8 Oct 2025 16:02:27 +0000
Subject: [PATCH 2/2] Update obsolete SystemWebAdapters API to
 HttpApplicationHost.RegisterHost

Co-authored-by: wadepickett <10985336+wadepickett@users.noreply.github.com>
---
 .../areas/authentication/samples/AspNetApp.cs | 17 +++++++------
 .../session/samples/remote/Global.asax.cs     | 25 +++++++++++--------
 .../fx-to-core/inc/remote-app-setup.md        | 17 +++++++------
 3 files changed, 34 insertions(+), 25 deletions(-)

diff --git a/aspnetcore/migration/fx-to-core/areas/authentication/samples/AspNetApp.cs b/aspnetcore/migration/fx-to-core/areas/authentication/samples/AspNetApp.cs
index 2a6524a53ceb..9015b3ed0016 100644
--- a/aspnetcore/migration/fx-to-core/areas/authentication/samples/AspNetApp.cs
+++ b/aspnetcore/migration/fx-to-core/areas/authentication/samples/AspNetApp.cs
@@ -14,13 +14,16 @@ protected void Application_Start()
         BundleConfig.RegisterBundles(BundleTable.Bundles);
 
         // <snippet_SystemWebAdapterConfiguration>
-        SystemWebAdapterConfiguration.AddSystemWebAdapters(this)
-            .AddProxySupport(options => options.UseForwardedHeaders = true)
-            .AddRemoteAppServer(options =>
-            {
-                options.ApiKey = ConfigurationManager.AppSettings["RemoteAppApiKey"];
-            })
-            .AddAuthenticationServer();
+        HttpApplicationHost.RegisterHost(builder =>
+        {
+            builder.AddSystemWebAdapters()
+                .AddProxySupport(options => options.UseForwardedHeaders = true)
+                .AddRemoteAppServer(options =>
+                {
+                    options.ApiKey = ConfigurationManager.AppSettings["RemoteAppApiKey"];
+                })
+                .AddAuthenticationServer();
+        });
         // </snippet_SystemWebAdapterConfiguration>
     }
 }
\ No newline at end of file
diff --git a/aspnetcore/migration/fx-to-core/areas/session/samples/remote/Global.asax.cs b/aspnetcore/migration/fx-to-core/areas/session/samples/remote/Global.asax.cs
index 30d640292a11..89073fe84f52 100644
--- a/aspnetcore/migration/fx-to-core/areas/session/samples/remote/Global.asax.cs
+++ b/aspnetcore/migration/fx-to-core/areas/session/samples/remote/Global.asax.cs
@@ -2,16 +2,19 @@ public class Global : HttpApplication
 {
         protected void Application_Start()
         {
-            SystemWebAdapterConfiguration.AddSystemWebAdapters(this)
-                .AddJsonSessionSerializer(options =>
-                {
-                    // Serialization/deserialization requires each session key to be registered to a type
-                    options.RegisterKey<int>("test-value");
-                    options.RegisterKey<SessionDemoModel>("SampleSessionItem");
-                })
-                // Provide a strong API key that will be used to authenticate the request on the remote app for querying the session
-                // ApiKey is a string representing a GUID
-                .AddRemoteAppServer(options => options.ApiKey = ConfigurationManager.AppSettings["RemoteAppApiKey"])
-                .AddSessionServer();
+            HttpApplicationHost.RegisterHost(builder =>
+            {
+                builder.AddSystemWebAdapters()
+                    .AddJsonSessionSerializer(options =>
+                    {
+                        // Serialization/deserialization requires each session key to be registered to a type
+                        options.RegisterKey<int>("test-value");
+                        options.RegisterKey<SessionDemoModel>("SampleSessionItem");
+                    })
+                    // Provide a strong API key that will be used to authenticate the request on the remote app for querying the session
+                    // ApiKey is a string representing a GUID
+                    .AddRemoteAppServer(options => options.ApiKey = ConfigurationManager.AppSettings["RemoteAppApiKey"])
+                    .AddSessionServer();
+            });
         }
 }
diff --git a/aspnetcore/migration/fx-to-core/inc/remote-app-setup.md b/aspnetcore/migration/fx-to-core/inc/remote-app-setup.md
index 17d4b31d2e2d..f5037eade436 100644
--- a/aspnetcore/migration/fx-to-core/inc/remote-app-setup.md
+++ b/aspnetcore/migration/fx-to-core/inc/remote-app-setup.md
@@ -4,7 +4,7 @@ description: Remote app setup
 author: wadepickett
 ms.author: wpickett
 monikerRange: '>= aspnetcore-6.0'
-ms.date: 09/16/2025
+ms.date: 10/08/2025
 ms.topic: article
 uid: migration/fx-to-core/inc/remote-app-setup
 zone_pivot_groups: migration-remote-app-setup
@@ -61,12 +61,15 @@ To configure the application to be available to handle the requests from the ASP
     ```CSharp
     protected void Application_Start()
     {
-        SystemWebAdapterConfiguration.AddSystemWebAdapters(this)
-            .AddRemoteAppServer(options =>
-            {
-                // ApiKey is a string representing a GUID
-                options.ApiKey = ConfigurationManager.AppSettings["RemoteAppApiKey"];
-            });
+        HttpApplicationHost.RegisterHost(builder =>
+        {
+            builder.AddSystemWebAdapters()
+                .AddRemoteAppServer(options =>
+                {
+                    // ApiKey is a string representing a GUID
+                    options.ApiKey = System.Configuration.ConfigurationManager.AppSettings["RemoteAppApiKey"];
+                });
+        });
         
         // ...existing code...
     }