DeveloperExceptionPageMiddleware
DeveloperExceptionPageMiddleware is ASP.NET Core middleware that catches unhandled pipeline exceptions and generates a detailed diagnostic error page for developers.
ASP.NET Core in Action, 3e
A developer exception page is an ASP.NET Core diagnostic page that displays detailed information about an unhandled exception during development.
- How it is used
- Provides detailed error feedback when an exception occurs during development.
- How deep it goes
- Explains pipeline exception capture, the 500 response, displayed diagnostics, and environment-specific setup without implementing custom middleware.
- Examples
- Shows a minimal API pipeline, a diagnostic page with stack trace and request details, and a production `/error` endpoint.
- What you can do after
- Diagnose/debug with it during development while choosing a safer error response for production.
Read how ASP.NET Core in Action, 3e explains DeveloperExceptionPageMiddleware →
Building Web APIs with ASP.NET Core
DeveloperExceptionPageMiddleware is ASP.NET Core middleware that captures pipeline exceptions and generates an HTML page containing detailed diagnostic information.
- How it is used
- Handles development-time HTTP pipeline failures by presenting detailed diagnostic information to developers.
- How deep it goes
- Explains synchronous and asynchronous exception capture, diagnostic contents, environment selection, and a verification endpoint.
- Examples
- Uses Program.cs configuration and test endpoints that throw Exception("test") to demonstrate generated error responses.
- What you can do after
- Diagnose/debug with it by enabling detailed development errors and routing nondevelopment failures through /error.
Read how Building Web APIs with ASP.NET Core explains DeveloperExceptionPageMiddleware →
Related concepts
- WebApplicationconfigured by · WebApplication is an ASP.NET Core application type that hosts configured services, runs the web server, and exposes the HTTP request-processing pipeline.
- request pipelineuses · A request pipeline is an ordered sequence of processing components through which HTTP requests and their responses pass in a web application.
- middlewareuses · 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.
- Swagger UIcontrasts with · Swagger UI is a web-based tool that renders OpenAPI descriptions as interactive documentation for exploring and testing HTTP APIs.
- HTMLproduces · HTML (HyperText Markup Language) is the standard markup language for structuring content and elements in web documents.
- ExceptionHandlerMiddlewarealternative to · ExceptionHandlerMiddleware is ASP.NET Core HTTP middleware that intercepts unhandled exceptions and generates or redirects to an error response.
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