Introduce WebFinalComponent

src/Umbraco.Web/Runtime/WebFinalComponent.cs

@@ -0,0 +1,17 @@
+using System.Web.Http;
+using Umbraco.Core.Composing;
+
+namespace Umbraco.Web.Runtime
+{
+    public class WebFinalComponent : IComponent
+    {
+        public void Initialize()
+        {
+            // ensure WebAPI is initialized, after everything
+            GlobalConfiguration.Configuration.EnsureInitialized();
+        }
+
+        public void Terminate()
+        { }
+    }
+}

src/Umbraco.Web/Runtime/WebFinalComposer.cs

@@ -0,0 +1,10 @@
+using Umbraco.Core.Composing;
+
+namespace Umbraco.Web.Runtime
+{
+    // composes after absolutely everything else = last
+    [ComposeAfter(typeof(IUserComposer))] // after IUserComposer, which comes after ICoreComposer, which comes after IRuntimeComposer
+    [ComposeAfter(typeof(IComposer))] // after plain IComposer
+    public class WebFinalComposer : ComponentComposer<WebFinalComponent>
+    { }
+}

src/Umbraco.Web/Runtime/WebRuntimeComponent.cs

@@ -90,9 +90,6 @@ namespace Umbraco.Web.Runtime
 
             // set routes
             CreateRoutes(_umbracoContextAccessor, _globalSettings, _surfaceControllerTypes, _apiControllerTypes);
-
-            // ensure WebAPI is initialized, after everything
-            GlobalConfiguration.Configuration.EnsureInitialized();
         }
 
         public void Terminate()

src/Umbraco.Web/Umbraco.Web.csproj

@@ -1186,6 +1186,8 @@
       <SubType>Component</SubType>
     </Compile>
     <Compile Include="WebViewPageExtensions.cs" />
+    <Compile Include="Runtime\WebFinalComponent.cs" />
+    <Compile Include="Runtime\WebFinalComposer.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="JavaScript\Resources.resx">