middleware-in-asp-dot-net-core

🔹 What is Middleware in ASP.NET Core?

In ASP.NET Core, a middleware is a component that is executed for every HTTP request that enters the application. Middleware components form the backbone of the request-processing pipeline.

In traditional ASP.NET, similar roles were played by HttpHandlers and HttpModules. However, middleware in ASP.NET Core offers a more modular, flexible, and testable approach to handling requests and responses.

Each middleware in the pipeline can:

Handle the request.
Modify the request or response.
Pass control to the next middleware in the sequence.

Middleware can be:

Built-in (provided by the framework).
Installed via NuGet packages.
Custom components you write yourself.

The order in which middleware is added in the Startup.cs file is crucial, as it defines the execution flow.

🔸 Middleware Execution Flow

Here’s a simplified flow of how middleware components work in sequence:

Request comes in.
Passes through each middleware in the order they are added.
A middleware can:
- Perform actions before the next component.
- Call the next middleware.
- Perform actions after the next component has finished.
Response flows back through the middleware stack in reverse order.

🔸 Example of Middleware in ASP.NET Core

    {
        public void Configure(IApplicationBuilder app)
        {
            app.Use(async (context, next) =>
            {
                Console.WriteLine("Middleware 1 - Before");
                await next.Invoke();
                Console.WriteLine("Middleware 1 - After");
            });

            app.Use(async (context, next) =>
            {
                Console.WriteLine("Middleware 2 - Before");
                await next.Invoke();
                Console.WriteLine("Middleware 2 - After");
            });

            app.Run(async (context) =>
            {
                Console.WriteLine("Final Middleware (Terminal)");
                await context.Response.WriteAsync("Hello from ASP.NET Core!");
            });
        }
    }

🔸 Output:

    Middleware 1 - Before
    Middleware 2 - Before
    Final Middleware (Terminal)
    Middleware 2 - After
    Middleware 1 - After

🔹 What is Middleware in ASP.NET Core?

🔸 Middleware Execution Flow

🔸 Example of Middleware in ASP.NET Core

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