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Explain Middleware and the ASP.NET Core Request Pipeline.

Senior .NET Core
Quick Answer Request enters → runs through middleware in order: exception handler → HSTS → static files → routing → auth → authorization → endpoint. Response returns through middlewares in reverse. Each middleware calls next() to continue or returns early to short-circuit. The pipeline is built in Program.cs with app.Use*() methods.

Answer

Middleware are sequential components that inspect, transform, route, or short-circuit HTTP requests. Each middleware can:

  • Read request
  • Modify response
  • Call next middleware
  • Handle the response entirely

The pipeline is flexible, efficient, and replaces legacy HTTP modules/handlers.

S
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