Status Codes
Mapping
| Operation | Status |
|---|---|
| Successful GET | 200 OK |
| Successful POST | 201 Created |
| Successful DELETE | 204 No Content |
| Invalid input | 400/422 |
| Not found | 404 |
| Unauthorized | 401 |
| Forbidden | 403 |
Key Points
- Understanding API Design: Status Codes is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
API Best Practices
Design Principles
- Use nouns, not verbs
- Plural resource names
- Consistent naming conventions
- Proper HTTP status codes
Versioning
- URI versioning (/v1/resource)
- Header versioning
- Deprecation policy
Documentation
- OpenAPI/Swagger specs
- Request/Response examples
- Error code documentation
- Rate limit documentation
Key Points
- Understanding API Design: Status Codes is essential for production systems
- Always consider scalability and maintainability
- Test thoroughly before deploying to production
- Monitor performance and set up alerting
Common Patterns
- Validation: Always validate input at the boundary
- Error Handling: Use structured error responses
- Logging: Log key events for debugging
- Testing: Unit, integration, and load tests
- Documentation: Keep docs updated with code changes
Practice Problems
Design and implement a solution for API Design: Status Codes in a backend system. Consider scalability, error handling, and production readiness.
Solution
// API Design: Status Codes implementation
// Key aspects: validation, error handling, logging, testing
public class APIDesignStatusCodes {
// Production-ready implementation
}Identify and handle edge cases for API Design: Status Codes. What happens under high load, with invalid input, or during failures?
Solution
// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotencyWrite a testing strategy for API Design: Status Codes. Include unit tests, integration tests, and performance tests.
Solution
// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injectionQuiz
1. POST create returns?
2. DELETE success returns?
3. What is the primary purpose of API Design: Status Codes?
4. What is a common mistake when implementing API Design: Status Codes?
Flashcards
Question
POST create status?
Click to reveal answer
Answer
201 Created
Question
DELETE success status?
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Answer
204 No Content
Question
What is API Design: Status Codes?
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Answer
API Design: Status Codes is a key concept in backend development.
Question
When to use API Design: Status Codes?
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Answer
Use API Design: Status Codes when building production systems that require reliability, scalability, and maintainability.
Question
API Design: Status Codes best practices
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Answer
Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.
Revision Notes
Key Takeaways
- 1.200: OK, 201: Created, 204: No Content
- 2.400/422: validation, 404: not found
- 3.401: unauthorized, 403: forbidden
- 4.Map each operation to correct status
Interview Tips
- •Choose correct status codes
- •Map operations to statuses
Cheat Sheet
Status Codes
- 200: OK, 201: Created, 204: No Content
- 400/422: validation
- 404: not found
- 401: unauthorized, 403: forbidden