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

Explains registration, Problem Details integration, plain-text defaults, pipeline reexecution, redirects, and error-handler failure risks.

UseStatusCodePages

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

UseStatusCodePages is an ASP.NET Core application-builder extension method that adds StatusCodePagesMiddleware to the request pipeline.

UseStatusCodePages is an ASP.NET Core application-builder extension method that adds StatusCodePagesMiddleware to the request pipeline. The middleware watches for 4xx and 5xx responses that have no body and supplies an error response. section 5.3.3 section 15.5

For JSON APIs, register AddProblemDetails() as well. StatusCodePagesMiddleware then adds a Problem Details body to eligible error responses, including errors produced by endpoints or other middleware. section 5.3.3

Add Problem Details for a 404 response

builder.Services.AddProblemDetails(); var app = builder.Build(); app.UseStatusCodePages(); app.MapGet("/", () => Results.NotFound()); app.Run(); The 404 response has no body initially, so the middleware adds a Problem Details body. section 5.3.3

Choose the status-code handling style that matches the application:

UseStatusCodePages() for basic handling; its default response is a plain-text error body and is mainly useful as a starting point. section 15.5
UseStatusCodePagesWithReExecute("/{0}") to rerun the pipeline, replacing {0} with the status code so /404 can render a tailored page. section 15.5
Prefer a reliable static error page when possible, because a failing dynamic error handler can leave the user with a generic browser error. section 15.5

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

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Related concepts

StatusCodePagesMiddlewareconfigures · StatusCodePagesMiddleware is ASP.NET Core middleware that generates or modifies responses for HTTP status codes, including adding a body to error responses that lack one.
UseExceptionHandleruses · UseExceptionHandler is an ASP.NET Core pipeline-extension method that configures handling for unhandled exceptions.
UseStatusCodePagesWithReExecuteincludes · UseStatusCodePagesWithReExecute is an ASP.NET Core application-builder method that configures status-code middleware to rerun requests through an alternative URL.

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.