Middleware In ASP.NET Core

 

Understanding Middleware in .NET Core

Middleware is a piece of code in an application pipeline used to handle requests and responses.

We may have a middleware component to authenticate a user, another piece of middleware to handle errors, and another middleware to serve static files such as JavaScript files, CSS files, images, etc.

Middleware can be built-in as part of the .NET Core framework, added via NuGet packages, or can be custom middleware.

These middleware components are configured as part of the application startup class in the configure method.

Configure methods set up a request processing pipeline for an ASP.NET Core application. It consists of a sequence of request delegates called one after the other.

Configure Methods Diagram

Middleware components can decide not to call the next piece of middleware in the pipeline. This is called short-circuiting or terminating the request pipeline.

Short-circuiting is often desirable because it avoids unnecessary work.

Middleware components are executed in the order they are added to the pipeline, and care should be taken to add the middleware in the right order; otherwise, the application may not function as expected.

This ordering is critical for security, performance, and functionality.

Request and Response Pipeline Diagram

Some middleware components may expose Run[Middleware] methods that run at the end of the pipeline.

Middleware Components

· Management console: Provides an overview of the middleware’s activities and configurations.

· Client interface.

· Internal interface.

· Platform interface.

· Contract manager.

· Session manager.

· Database manager.

· Runtime monitor.

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