What is Middleware in ASP.NET Core?

Question

Anubhav Kumar · Answer

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?
Middleware is a piece of code that processes requests coming into the application and
responses going out.It sits between the server and your application logic.Each middleware component can:
Inspect the incoming request,Perform some action (e.g., authentication, logging, routing),Pass control to the next middleware in the pipeline,Or short-circuit the pipeline and generate a response directly.
How Middleware Works:
An HTTP request arrives.It flows through each middleware component in order.Each middleware can:
Process the request,Pass control to the next middleware,Optionally modify the response on the way back.
Common Middleware Examples:
Routing — decides which endpoint handles the request.Authentication — checks who the user is.Authorization — checks if the user can access resources.Static Files — serves files like images, CSS, JS.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 =andgt;
    {
        endpoints.MapControllers();
    });
}
Middleware is added in the order you want it to execute.The naming convention is typically .UseXYZ() for middleware that passes control on, or
.Run() for terminal middleware that ends the pipeline.
Why Middleware?
Enables flexible and modular processing of requests.Allows developers to inject functionality (logging, security, compression) easily.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
and

interview

What is Middleware in ASP.NET Core?

Anubhav Kumar

Can you answer this question?

1 Answers

What is Middleware?

How Middleware Works:

Common Middleware Examples:

Adding Middleware

Why Middleware?

Summary:

Liked By

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