Debug ScriptBundle results in 404 if virtualPath parameter contains a dot

I spent some time debuging a ScriptBundle problem last Friday and want to share my experience. The original code in a MVC project App_Start/BundleConfig.cs file: Code Snippet bundles.Add( new ScriptBundle ( "~/bundles/jquery.signalR" ).Include( "~/Scripts/jquery.signalR-{version}.js" )); And in a cshtml file, the bundle is included as: Code Snippet @ Scripts .Render( "~/bundles/jquery.signalR" ) In local IIS Express debugging mode, I found no problem. So I deployed to Azure to see if project works in real server. And to my surprise, it reported an error that SignalR is not loaded. The following image from the IE F12 developer tools shows a 404 is returned when getting /bundles/jquery.signalR . To find out if bundling...(read more) ...