How deeply does ASP.NET Core in Action, 3e cover terminal middleware?

Explains short-circuiting, reverse response flow, and practical use cases, but stops short of implementing the three custom middleware approaches.

Terminal middleware

As explained in ASP.NET Core in Action, 3e

Terminal middleware is a middleware component that stops further pipeline processing by generating and returning a response.

Terminal middleware short-circuits the ASP.NET Core middleware pipeline by generating and returning a response. Later middleware, including endpoint middleware, never receives that request. section 4.1

Requests normally move forward through middleware until a component creates a response. That response then travels backward through the earlier components before reaching the web server, so middleware can run logic on both directions. section 4.1

Returning the current time

A small custom terminal component can return the current time as plain text whenever the application receives a request. This response ends processing rather than flowing to an endpoint. section 31.1

Use terminal middleware for small responses that do not need endpoint routing, such as a welcome page or Swagger response. Prefer endpoint routing when it provides the needed behavior; use custom middleware for occasional specialized requirements. section 31.1

How ASP.NET Core in Action, 3e covers it

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Building Web APIs with ASP.NET CoreTerminal middleware is middleware that can end HTTP request processing by returning a response without invoking later pipeline components.

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Related concepts

middlewarekind of · Middleware is an intermediate software component or layer that processes or mediates requests, messages, or operations between other components, often adding behavior or controlling their flow.
Runproduced by · Run is an ASP.NET Core API operation that either terminates a request pipeline with middleware or starts the application host to process requests.
endpoint routingcontrasts with · Endpoint routing is an ASP.NET Core mechanism that matches incoming HTTP requests to endpoints and separates endpoint selection from endpoint execution.

This explainer was generated by Manning's knowledge graph from the text of ASP.NET Core in Action, 3e. The section links point to the parts of the book it draws on.