Re-execution middleware works with POST (#62267)

* Add tests for forms under a route with re-execution middleware.

* Fix - treat POST as POST, even when re-execution middleware is set.

Author: ilonatommy

src/Components/Endpoints/src/RazorComponentEndpointInvoker.cs

@@ -175,11 +175,10 @@ await _renderer.InitializeStandardComponentServicesAsync(
     private async Task<RequestValidationState> ValidateRequestAsync(HttpContext context, IAntiforgery? antiforgery)
     {
         var processPost = HttpMethods.IsPost(context.Request.Method) &&
-            // Disable POST functionality during exception handling and reexecution.
+            // Disable POST functionality during exception handling.
             // The exception handler middleware will not update the request method, and we don't
             // want to run the form handling logic against the error page.
-            context.Features.Get<IExceptionHandlerFeature>() == null &&
-            context.Features.Get<IStatusCodePagesFeature>() == null;
+            context.Features.Get<IExceptionHandlerFeature>() == null;
 
         if (processPost)
         {

src/Components/test/E2ETest/ServerRenderingTests/FormHandlingTests/FormWithParentBindingContextTest.cs

@@ -49,6 +49,20 @@ public void CanDispatchToTheDefaultForm(bool suppressEnhancedNavigation)
         DispatchToFormCore(dispatchToForm);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public void CanDispatchToTheDefaultFormWithReExecutionMiddleware(bool suppressEnhancedNavigation)
+    {
+        var dispatchToForm = new DispatchToForm(this)
+        {
+            Url = "reexecution/forms/default-form",
+            FormCssSelector = "form",
+            SuppressEnhancedNavigation = suppressEnhancedNavigation,
+        };
+        DispatchToFormCore(dispatchToForm);
+    }
+
     [Fact]
     public void PlainFormIsNotEnhancedByDefault()
     {
@@ -891,6 +905,21 @@ public async Task CanModifyTheHttpResponseDuringEventHandling()
         Assert.Equal("ModifyHttpContext", cookie.Value);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public void FormNoAntiforgeryReturnBadRequestWithReExecutionMiddleware(bool suppressEnhancedNavigation)
+    {
+        var dispatchToForm = new DispatchToForm(this)
+        {
+            Url = "reexecution/forms/no-antiforgery",
+            FormCssSelector = "form",
+            ShouldCauseBadRequest = true,
+            SuppressEnhancedNavigation = suppressEnhancedNavigation,
+        };
+        DispatchToFormCore(dispatchToForm);
+    }
+
     [Theory]
     [InlineData(true)]
     [InlineData(false)]
@@ -973,6 +1002,21 @@ public void FormNoHandlerReturnBadRequest(bool suppressEnhancedNavigation)
         DispatchToFormCore(dispatchToForm);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public void FormNoHandlerReturnBadRequestWithReExecutionMiddleware(bool suppressEnhancedNavigation)
+    {
+        var dispatchToForm = new DispatchToForm(this)
+        {
+            Url = "reexecution/forms/no-handler",
+            FormCssSelector = "form",
+            ShouldCauseBadRequest = true,
+            SuppressEnhancedNavigation = suppressEnhancedNavigation,
+        };
+        DispatchToFormCore(dispatchToForm);
+    }
+
     [Theory]
     [InlineData(true)]
     [InlineData(false)]

src/Components/test/testassets/Components.TestServer/RazorComponents/Pages/Forms/DefaultForm.razor

@@ -1,4 +1,5 @@
 @page "/forms/default-form"
+@page "/reexecution/forms/default-form"
 @using Microsoft.AspNetCore.Components.Forms
 
 <h2>Default form</h2>

src/Components/test/testassets/Components.TestServer/RazorComponents/Pages/Forms/FormNoAntiforgery.razor

@@ -1,4 +1,5 @@
 @page "/forms/no-antiforgery"
+@page "/reexecution/forms/no-antiforgery"
 @using Microsoft.AspNetCore.Components.Forms
 
 <h2>Default form</h2>

src/Components/test/testassets/Components.TestServer/RazorComponents/Pages/Forms/FormNoHandler.razor

@@ -1,4 +1,5 @@
 @page "/forms/no-handler"
+@page "/reexecution/forms/no-handler"
 @using Microsoft.AspNetCore.Components.Forms
 
 <h2>Form with no handler</h2>