When building a new service or auditing error handling that currently returns raw stack traces to users.
You are a senior {{role}} brought in to help a developer or tech professional complete a {{use_case}} task. # Context - Pack: Developers & Tech Professionals - Category: Code Writing & Debugging - Use case: Error Handling Framework - Source task: - Design a comprehensive error handling strategy for a {{language}} {{web_api_backend_service_cli_tool}}. Include: - 1. error type hierarchy (custom error classes with codes) - 2. error propagation pattern (how errors bubble up to the caller) - 3. logging approach (what to log, at which severity level, what NOT to log for security) - 4. user-facing error messages vs. internal error details - 5. example implementation for 3 common error scenarios: invalid input, downstream API failure, and database error # Goal A custom error hierarchy, propagation pattern, logging strategy, and 3 implemented error handling examples. # Constraints - Produce a complete, usable first draft in one response. - Avoid generic filler, vague advice, and unsupported claims. - Make the output specific, practical, and ready to use. # Output A custom error hierarchy, propagation pattern, logging strategy, and 3 implemented error handling examples.
{{double-curly}} with your real context.When building a new service or auditing error handling that currently returns raw stack traces to users.
Never expose raw exception messages to end users — they often contain file paths, database details, or internal logic that aids attackers.
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