System.Web.WebPages.WebPageRoute.DoPostResolveRequestCache C# (CSharp) Method

        internal void DoPostResolveRequestCache(HttpContextBase context)
        {
            if (IsExplicitlyDisabled)
            {
                // If the root config is explicitly disabled, do not process the request.
                return;
            }

            // Parse incoming URL (we trim off the first two chars since they're always "~/")
            string requestPath = context.Request.AppRelativeCurrentExecutionFilePath.Substring(2) + context.Request.PathInfo;
            string[] registeredExtensions = WebPageHttpHandler.SupportedExtensions;

            // Check if this request matches a file in the app
            WebPageMatch webpageRouteMatch = MatchRequest(requestPath, registeredExtensions, VirtualPathFactoryManager.InstancePathExists, context, DisplayModeProvider.Instance);
            if (webpageRouteMatch != null)
            {
                // If it matches then save some data for the WebPage's UrlData
                context.Items[typeof(WebPageMatch)] = webpageRouteMatch;

                string virtualPath = "~/" + webpageRouteMatch.MatchedPath;

                // Verify that this path is enabled before remapping
                if (!WebPagesDeployment.IsExplicitlyDisabled(virtualPath))
                {
                    IHttpHandler handler = WebPageHttpHandler.CreateFromVirtualPath(virtualPath);
                    if (handler != null)
                    {
                        SessionStateUtil.SetUpSessionState(context, handler);
                        // Remap to our handler
                        context.RemapHandler(handler);
                    }
                }
            }
            else
            {
                // Bug:904704 If its not a match, but to a supported extension, we want to return a 404 instead of a 403
                string extension = PathUtil.GetExtension(requestPath);
                foreach (string supportedExt in registeredExtensions)
                {
                    if (String.Equals("." + supportedExt, extension, StringComparison.OrdinalIgnoreCase))
                    {
                        throw new HttpException(404, null);
                    }
                }
            }
        }