While the IIS Site/Virtual still needs an IIS Application Pool to run in, the Application Pool should be set to use No Managed Code. This means you can't easily mix ASP.NET Core and other frameworks in the same Site/Virtual directory, which feels a bit like a step back given that you could easily mix frameworks before in IIS. ![]() All requests - even those mapped to top level Handlers like ASPX bypass the IIS pipeline and are forwarded to the ASP.NET Core process. The AspNetCoreModule is a native IIS module that hooks into the IIS pipeline very early in the request cycle and immediately redirects all traffic to the backend ASP.NET Core application. NET Core SDK on your Dev machine) the AspNetCoreModule is available in the IIS native module list: Once you've installed the hosting bundle (or you install the. The AspNetCoreModule has to be installed on your server and is part of the ASP.NET Core Server Hosting Bundle. They are not loaded into an IIS worker process, but rather loaded through a native IIS module called AspNetCoreModule that executes the external Console application. Here's what it looks like when you run your ASP.NET Core application behind an IIS Web front:ĪSP.NET Core applications are standalone Console applications invoked through the dotnet runtime command. If you run on Windows you will likely want to run Kestrel behind IIS to gain infrastructure features like port 80/443 forwarding via Host Headers, process lifetime management and certificate management to name a few. A seperate post describes the details of In Process/Out of Process hosting. It does not include Web management services as a full featured server like IIS does.Īs of ASP.NET Core 2.2 IIS Hosting does support a new InProcess hosting mechanism. It's fast and functional in getting network requests into your application, but it's 'just' a raw Web server. NET Web Server implementation that has been heavily optimized for throughput performance. Things are quite different with ASP.NET Core which doesn't run in-process to the IIS worker process, but rather runs as a separate, out of process Console application that runs its own Web server using the Kestrel component. Requests come in from http.sys and are dispatched to the appropriate site that is mapped to the Application Pool and the HttpRuntime instance hosted there. NET Runtime on your application's behalf and brings up the HttpRuntime object which is then used to fire requests through the ASP.NET application pipeline as requests come in from the native http.sys driver. The native runtime manager instantiates the. The AppPool hosts your ASP.NET application and your application is instantiated by the built-in ASP.NET hosting features in IIS. In a classic ASP.NET application everything is hosted inside of an IIS Worker Process (w3wp.exe) which is the IIS Application Pool. Let's take a look and see how IIS fits into ASP.NET Core applications.īefore we take a look at ASP.NET Core hosting lets review how classic ASP.NET runs ASP.NET applications: For Windows IIS (or another reverse proxy) will continue to be an important part of the server even with ASP.NET Core applications. This is actually a recommended practice on Windows in order to provide port 80/443 forwarding which kestrel doesn't support directly. You can however run IIS as a front end proxy for ASP.NET Core applications, because Kestrel is a raw Web server that doesn't support all features a full server like IIS supports. ![]() ASP.NET Core applications have their own self-hosted Web server and process requests internally using this self-hosted server instance. It's not hosted inside of IIS and it doesn't need IIS to run. The most important thing to understand about hosting ASP.NET Core is that it runs as a standalone, out of process Console application. In this post I'll explain how ASP.NET Core runs in the context of IIS and how you can deploy your ASP.NET Core application to IIS. NET Core applications in IIS work radically different than previous versions of ASP.NET. When you build ASP.NET Core applications and plan on running them on IIS, you'll find that.
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