I'll translate the Arabic text to natural, high-quality English while preserving technical terms and formatting: I'm here to simply explain the difference between the HTTP Request Lifecycle in the old ASP.NET Framework and the new ASP.NET Core, as well as the significant changes that have occurred in the Pipeline from then until now. This explanation will help you understand how requests (Requests) flow through the system and why ASP.NET Core has become a better choice for developers today. First: The HTTP Request Lifecycle in the old version (ASP.NET Framework) When a client sends a request like /Employee/GetAll, the following occurs: 1️⃣ Receiving the request The Web Server (IIS) first receives the request, and the entire Pipeline is within IIS, not within the Web Application itself. 2️⃣ Entering the request into the Pipeline The request comes with two separate entities: HttpRequest and HttpResponse, both tied to System.Web.HttpContext. Here's the problem: The Context is very large and carries things the application doesn't need. 3️⃣ Passing through all Modules / Middlewares The request must go through all the Modules, regardless of their number. There's no real flexibility in controlling their order. 4️⃣ Routing It reaches the Routing Module and extracts: - Controller Name - Action Name 5️⃣ Determining the Controller and Action It reaches MapControllerRoute, which converts the request to the appropriate Controller and Action. 6️⃣ Controlling inside the Controller based on the application type If it's an MVC application: - Fetch data from the database - Populate the ViewModel or Model - Send the Model to the View - Render the View inside the Layout - Generate the final HTML page - Return HTML as a Response If it's a Web API: - Fetch data from the database - Populate the DTO or Model - Convert the result to JSON - Return a JSON Response 7️⃣ The response returns to the Pipeline and then reaches the Browser. ❌ Disadvantages of the old version: - Dependent on IIS (not Cross-Platform) - HttpContext is large and very difficult to test (Testing) - Fixed and inflexible Pipeline - Lower performance (Performance) - Complex and monolithic Architecture Second: The HTTP Request Lifecycle in the new version (ASP.NET Core) 1️⃣ Receiving the request The Web Server (Kestrel or IIS) receives the request and enters it directly into the application itself. This is the major difference: The Pipeline is now within the Application, and you control its configuration... ### Middleware Order 2️⃣ The request enters the Pipeline in `Program.cs`. The Pipeline is modular and flexible. 3️⃣ A new `HttpContext` is created. The request travels with a single, lightweight `HttpContext` that includes `HttpRequest` and `HttpResponse`, meaning the Request and Response are part of a single, added Context. 4️⃣ Passing through Middlewares according to your choice. You determine the order, which ones to remove or add. 5️⃣ Reaching the Controller and Action. The familiar steps are: Get Data → Fill Model → Render View or Return JSON 6️⃣ The response returns to the Pipeline in reverse order and then reaches the Browser. ✔ Features of the new version: - **Cross-Platform** — Works on Linux / Windows / macOS - **Lightweight HttpContext** — Easy to test - **Flexible & Modular Pipeline** — You determine the order of the Middleware - **High Performance** — Faster and lighter in memory usage - **Clean & Modern Architecture** — Suitable for cloud applications (Cloud Apps) ### Summary 🎯 The main difference ASP.NET Core brings is: - A flexible, modular, and easily controllable Pipeline - A lightweight and easy-to-test Context - Higher performance and a modern architecture - Cross-platform support In short, if you want faster, more flexible, and easily testable and developable applications, ASP.NET Core is the current choice for developers.