In this section, we are going to understand new pipeline concept in ASP.NET Core which is Middleware. If you have been doing ASP.NET stuff since a while, you must be knowing that HTTP-Handlers and HTTP-Modules have always been part of ASP.NET processing structure. But, with new ASP.NET Core concept, Handlers and Modules are now history. They are no longer in use. Rather than that new Pipeline is implemented and that is called Middleware. Developers can utilize normal existing Middlewares or they can write their own custom middleware depending on the need. Below is the high level diagram of MiddleWare.