ExceptionHandlerMiddleware
ExceptionHandlerMiddleware is ASP.NET Core HTTP middleware that intercepts unhandled exceptions and generates or redirects to an error response.
ASP.NET Core in Action, 3e
Error-handling middleware is middleware that intercepts application errors and modifies the HTTP response before it is returned to the client.
- How it is used
- Handles unhandled application exceptions in production middleware pipelines while returning controlled, user-friendly responses.
- How deep it goes
- Explains response replacement, environment-based registration, and pipeline reexecution, but defers building custom middleware.
- Examples
- Uses /error endpoints, generic JSON or plain-text responses, and branded Razor Pages error pages as concrete handlers.
- What you can do after
- Configure it via UseExceptionHandler to deliver safe production error responses without exposing sensitive application details.
Read how ASP.NET Core in Action, 3e explains ExceptionHandlerMiddleware →
Building Web APIs with ASP.NET Core
ExceptionHandlingMiddleware is HTTP middleware that catches exceptions and forwards relevant error information to a configurable error handler.
- How it is used
- Handles application-level HTTP exceptions safely in staging and production while routing failures to a controlled error endpoint.
- How deep it goes
- Explains environment selection, route implementation, response generation, testing, and customization, but not middleware internals.
- Examples
- Uses /error controller and Minimal API endpoints, deliberate test exceptions, and environment or configuration switches.
- What you can do after
- Operate/configure ASP.NET Core exception handling with a safe error route and customize status codes, logging, or notifications.
Read how Building Web APIs with ASP.NET Core explains ExceptionHandlerMiddleware →
Related concepts
- UseExceptionHandlerconfigured by · UseExceptionHandler is an ASP.NET Core pipeline-extension method that configures handling for unhandled exceptions.
- 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.
- pipeline reexecutionuses · Pipeline reexecution is the process of running a request-processing middleware pipeline again for a different path after an exception or other handling condition.
- IProblemDetailsServiceuses · IProblemDetailsService is an ASP.NET Core service interface that generates Problem Details responses for errors.
- exception filteralternative to · An exception filter is an ASP.NET Core MVC filter that processes exceptions not handled by an endpoint or other applicable filters.
- DeveloperExceptionPageMiddlewarealternative to · DeveloperExceptionPageMiddleware is ASP.NET Core middleware that catches unhandled pipeline exceptions and generates a detailed diagnostic error page for developers.
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