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home / developersection / interviews / what is middleware in asp.net core?
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Anubhav Sharma
Anubhav Sharma

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The Anubhav portal was launched in March 2015 at the behest of the Hon'ble Prime Minister for retiring government officials to leave a record of their experiences while in Govt service .

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1 Answers

Anubhav Sharma
Anubhav Sharma 19 May 2025
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Middleware in ASP.NET Core is a fundamental concept that refers to software components assembled into a pipeline to handle HTTP requests and responses.

What is Middleware?

  1. Middleware is a piece of code that processes requests coming into the application and responses going out.
  2. It sits between the server and your application logic.
  3. Each middleware component can:
    1. Inspect the incoming request,
    2. Perform some action (e.g., authentication, logging, routing),
    3. Pass control to the next middleware in the pipeline,
    4. Or short-circuit the pipeline and generate a response directly.

How Middleware Works:

  1. An HTTP request arrives.
  2. It flows through each middleware component in order.
  3. Each middleware can:
    1. Process the request,
    2. Pass control to the next middleware,
    3. Optionally modify the response on the way back.

Common Middleware Examples:

  1. Routing — decides which endpoint handles the request.
  2. Authentication — checks who the user is.
  3. Authorization — checks if the user can access resources.
  4. Static Files — serves files like images, CSS, JS.
  5. Exception Handling — catches and processes errors.

Adding Middleware

Middleware components are added in the Startup.Configure method (or Program.cs in .NET 6+), using extension methods on IApplicationBuilder:

public void Configure(IApplicationBuilder app)
{
    app.UseRouting();

    app.UseAuthentication();
    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}
  1. Middleware is added in the order you want it to execute.
  2. The naming convention is typically .UseXYZ() for middleware that passes control on, or .Run() for terminal middleware that ends the pipeline.

Why Middleware?

  1. Enables flexible and modular processing of requests.
  2. Allows developers to inject functionality (logging, security, compression) easily.
  3. Provides fine-grained control over the HTTP pipeline.

Summary:

Concept Description
Middleware Components that process HTTP requests/responses in a pipeline
Pipeline Ordered sequence of middleware components
Each Middleware Can handle, modify, or short-circuit requests
Added via app.Use...() in Startup.Configure or Program.cs
Examples Authentication, Logging, Static files, Routing
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