IExceptionHandler interface

AddExceptionHandler registration

AddProblemDetails registration

UseExceptionHandler called

TryHandleAsync returns true

ProblemDetails title field

ProblemDetails detail field

ProblemDetails instance field

Content-Type application/problem+json

No stack trace in 500 response

Typed exception status codes

OperationCanceledException caught separately

499 status code returned

Not logged at Error level

Logged at Information level

No exception details in 499 response body

CancellationToken in GET endpoint 1

CancellationToken in GET endpoint 2

CancellationToken passed to service calls

Generic exceptions still return 500

UseStatusCodePages present

UseExceptionHandler present

Exception handler before routing

UseStatusCodePages before routing

pipeline_notes explains routing misses

pipeline_notes explains middleware ordering

AddProblemDetails registered

UseStatusCodePages with ProblemDetails format

InvalidModelStateResponseFactory configured

Returns ValidationProblemDetails

Title set to VALIDATION_ERROR

Status set to 400

Instance set to request path

Content-Type application/problem+json

At least four validation attributes

No manual validation in controller

validation_design.md mentions errors dictionary

No Console.WriteLine

No string interpolation in LogError

Named placeholders in log messages

Exception passed to logger

LogWarning for known API exceptions

LogError for unhandled exceptions

Request path included in log

Request method included in log

compliance_report identifies Console.WriteLine issue