From a2b9691b7877d47a1f9cbb7a8f34cd8cc9305667 Mon Sep 17 00:00:00 2001
From: Robert Dima <robert.dima@plantanapp.com>
Date: Mon, 11 May 2026 20:19:49 +0300
Subject: [PATCH] Fix unreliable DnnMvcHandler.DisableMvcResponseHeader

---
 DNN Platform/DotNetNuke.Web.Mvc/DnnMvcHandler.cs  |  2 +-
 .../Framework/Modules/ModuleApplication.cs        | 15 ++++++++-------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/DNN Platform/DotNetNuke.Web.Mvc/DnnMvcHandler.cs b/DNN Platform/DotNetNuke.Web.Mvc/DnnMvcHandler.cs
index 5f37f95e7c5..94b3bd55b1e 100644
--- a/DNN Platform/DotNetNuke.Web.Mvc/DnnMvcHandler.cs	
+++ b/DNN Platform/DotNetNuke.Web.Mvc/DnnMvcHandler.cs	
@@ -130,7 +130,7 @@ private ModuleRequestContext GetModuleRequestContext(HttpContextBase httpContext
             {
                 HttpContext = httpContext,
                 ModuleContext = moduleContext,
-                ModuleApplication = new ModuleApplication(this.RequestContext, DisableMvcResponseHeader)
+                ModuleApplication = new ModuleApplication(this.RequestContext)
                 {
                     ModuleName = desktopModule.ModuleName,
                     FolderPath = desktopModule.FolderName,
diff --git a/DNN Platform/DotNetNuke.Web.Mvc/Framework/Modules/ModuleApplication.cs b/DNN Platform/DotNetNuke.Web.Mvc/Framework/Modules/ModuleApplication.cs
index 59daa7a514d..327f53eda43 100644
--- a/DNN Platform/DotNetNuke.Web.Mvc/Framework/Modules/ModuleApplication.cs	
+++ b/DNN Platform/DotNetNuke.Web.Mvc/Framework/Modules/ModuleApplication.cs	
@@ -32,20 +32,23 @@ public class ModuleApplication
         private bool initialized;
 
         public ModuleApplication()
-            : this(null, false)
+            : this(null)
         {
         }
 
         public ModuleApplication(bool disableMvcResponseHeader)
-            : this(null, disableMvcResponseHeader)
+            : this(null)
         {
         }
 
         public ModuleApplication(RequestContext requestContext, bool disableMvcResponseHeader)
+            : this(requestContext)
         {
-            this.RequestContext = requestContext;
+        }
 
-            DisableMvcResponseHeader = disableMvcResponseHeader;
+        public ModuleApplication(RequestContext requestContext)
+        {
+            this.RequestContext = requestContext;
 
             // ReSharper disable once DoNotCallOverridableMethodsInConstructor
             this.ControllerFactory = Globals.GetCurrentServiceProvider().GetRequiredService<IControllerFactory>();
@@ -70,8 +73,6 @@ public ModuleApplication(RequestContext requestContext, bool disableMvcResponseH
 
         public ViewEngineCollection ViewEngines { get; set; }
 
-        private static bool DisableMvcResponseHeader { get; set; }
-
         public virtual ModuleRequestResult ExecuteRequest(ModuleRequestContext context)
         {
             this.EnsureInitialized();
@@ -164,7 +165,7 @@ protected internal virtual void Init()
 
         protected internal virtual void AddVersionHeader(HttpContextBase httpContext)
         {
-            if (!DisableMvcResponseHeader)
+            if (!DnnMvcHandler.DisableMvcResponseHeader)
             {
                 httpContext.Response.AppendHeader(MvcVersionHeaderName, MvcVersion);
             }