Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Handlers/TransferRequestHandler.cs

@@ -0,0 +1,43 @@
+//------------------------------------------------------------------------------
+// <copyright file="TransferRequestHandler.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Handlers {
+    using System;
+    using System.Web.Hosting;
+    
+    internal class TransferRequestHandler : IHttpHandler {
+        
+        public void ProcessRequest(HttpContext context) {
+            IIS7WorkerRequest wr = context.WorkerRequest as IIS7WorkerRequest;
+            if (wr == null) {
+                throw new PlatformNotSupportedException(SR.GetString(SR.Requires_Iis_Integrated_Mode));
+            }
+            // Dev10 848405: use original unencoded URL (i.e., pass null for url so W3_REQUEST::SetUrl is not called)
+            // Dev11 32511: Extensionless URL Handler should not pass parent IHttpUser to child requests
+            wr.ScheduleExecuteUrl(null,
+                                  null,
+                                  null,
+                                  true,
+                                  context.Request.EntityBody,
+                                  null,
+                                  preserveUser: false);
+            
+            // force the completion of the current request so that the 
+            // child execution can be performed immediately after unwind
+            context.ApplicationInstance.EnsureReleaseState();
+
+            // DevDiv Bugs 162750: IIS7 Integrated Mode:  TransferRequest performance issue
+            // Instead of calling Response.End we call HttpApplication.CompleteRequest()
+            context.ApplicationInstance.CompleteRequest();
+        }
+
+        public bool IsReusable {
+            get {
+                return true;
+            }
+        }
+    }
+}