What is Middleware in ASP.NET Core? See Example

Middleware in ASP.NET Core is software components that are assembled into an HTTP request pipeline. Each component can handle requests, responses, or pass control to the next component. Middleware enables features like authentication, logging, routing, and error handling.

Key Features:

• Composes the HTTP request/response pipeline
• Can modify requests and responses
• Supports built-in and custom middleware
• Enables cross-cutting concerns like logging and authentication
• Highly configurable and order-sensitive

Example:
Adding middleware in Program.cs:

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.Use(async (context, next) =>
{
    Console.WriteLine("Request incoming");
    await next.Invoke();
    Console.WriteLine("Response outgoing");
});

app.MapGet("/", () => "Hello Middleware!");

app.Run();

Middleware in ASP.NET Core provides flexibility and modularity, allowing developers to customize request processing for web applications.

Citations:

• Learn more on Savanka
• Official ASP.NET Core Documentation