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How do you map different exception types to different HTTP status codes in a global exception handler? How do you handle exceptions specifically within minimal API endpoints, given they don't use the traditional MVC exception filter pipeline? What is the difference between handling exceptions with middleware versus using try/catch blocks directly in controller actions? How should a global exception handler differentiate between exceptions that should return specific client-facing details versus exceptions that should always show a generic message? How do you write an integration test verifying that your global exception handler produces the correct error response shape? What is ProblemDetails (RFC 7807/9457), and how does ASP.NET Core support it for standardized error responses? What information should be excluded from error responses in production to avoid leaking sensitive implementation details? How would you implement custom middleware to catch and log unhandled exceptions before they reach the exception handler, adding request-specific context? How does exception handling middleware interact with model validation errors in ASP.NET Core, and how do they typically produce different error response paths? How do you handle exceptions that occur during response streaming, after the response has already partially started sending to the client?
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What is the role of the [ApiController] attribute in automatically handling certain error scenarios without explicit exception handling code?

Intermediate

Answer

[ApiController] enables several automatic API-friendly behaviors beyond just validation: automatic 400 responses for invalid model state, automatic binding source inference, and automatic problem details for certain error responses -- reducing boilerplate that would otherwise require manual exception handling or explicit checks in every action for common scenarios like malformed request bodies or missing required parameters.
[ApiController]
[Route("api/[controller]")]
public class ProductsController : ControllerBase {
    [HttpPost]
    public IActionResult Create(ProductDto dto) {
        // No need to manually check ModelState.IsValid --
        // [ApiController] already returned 400 automatically if dto was invalid
        return Ok(_service.Create(dto));
    }
}
Real-world example A team migrating older MVC controllers (which required manual `if (!ModelState.IsValid) return BadRequest(ModelState);` checks in every action) to use [ApiController] removes dozens of duplicated validation-checking lines across their controllers.

Common follow-ups: What other automatic behaviors does [ApiController] enable besides validation short-circuiting?;How would you customize or disable this automatic behavior for specific scenarios?

RESTful Web APIs & Controllers;Diagnostics & Performance
All 15 Global Exception Handling & Middleware questions