Running inside of IIS really doesnt buy you anything anymore that you cant easily simulate with a command line environment.Its not hosted inside of IIS and it doesnt need IIS to run.
ASP.NET Core applications have their own self-hosted Web server and process requests internally using this self-hosted server instance. This is actually a recommended practice on Windows in order to provide port 80443 forwarding which kestrel doesnt support directly. For Windows IIS (or another reverse proxy) will continue to be an important part of the server even with ASP.NET Core applications. The AppPool hosts your ASP.NET application and your application is instantiated by the built-in ASP.NET hosting features in IIS. Kestrel is a.NET Web Server implementation that has been heavily optimized for throughput performance. Its fast and functional in getting network requests into your application, but its just a raw Web server. ![]() A seperate post describes the details of In ProcessOut of Process hosting. 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. All requests - even those mapped to top level Handlers like ASPX bypass the IIS pipeline and are forwarded to the ASP.NET Core process. This means you cant easily mix ASP.NET Core and other frameworks in the same SiteVirtual directory, which feels a bit like a step back given that you could easily mix frameworks before in IIS. Since the App Pool acts merely as a proxy to forward requests, theres no need to have it instantiate a.NET runtime. You essentially get the same behavior as classic ASP.NET applications that are managed by WAS (Windows Activation Service). In essence, IIS acts a reverse proxy simply forwarding requests to your ASP.NET Core Web running the Kestrel Web server on a different port. The configuration in the web.config file points the module at your applications root folder and the startup DLL that needs to be launched. Limit environment variable settings for specific startup options you need to configure the global environment. Otherwise stick to configuration file settings - or on Azure use the application settings to merge values into your config. While its possible to directly access Kestrel via an IP Address and available port, there are number of reasons why you dont want to expose your application directly this way in production environments. Kestrel doesnt support host header routing which is required to allow multiple port 80 bindings on a single IP address. The AspNetCoreModule provides the required process management to ensure that your AspNetCore application is always available even after a crash. IIS is really good and efficient at processing non-application requests, so its worthwhile to take advantage of that. You can let IIS handle the tasks that its really good at, and leave the dynamic tasks to pass through to your ASP.NET Core application. Visual Studio Load Operation Failed Iis Full IIS BecauseYes, in the past there were very good reasons to run full IIS because there were always a number of things that behaved very differently in full IIS compared to IIS Express. Why Because ASP.NET Core applications arent actually running inside of IIS. Visual Studio Load Operation Failed Iis Code And InWhether you running called from IIS, IIS Express or whether you do dotnet run directly from the command line - you are running the exact same code and in most cases the exact same execution environment.
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