Module problem_response 

RFC 7807 Problem Details helpers for consistent HTTP error responses.

Functions

build_problem

Build a Problem Details value with type URI and detail.

problem_status_title

Standard HTTP status phrase for Problem Details title.

problem_to_bytes

Serialize problem details to JSON bytes (for sync response setup).

write_forbidden

403 with optional extension fields (e.g. required_role).

write_problem

Convenience: status + detail string.

write_problem_response

Write RFC 7807 problem+json to the response.