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REST APIs

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HTTP Methods and Status Codes

1. What is the Difference Between PUT and POST Methods?

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2. What are Idempotent HTTP Methods, and Why are They Important?

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3. What are some common HTTP status codes used in REST APIs?

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4. How Do You Handle Error Responses in REST APIs?

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5. Explain the core components of an HTTP Response.

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6. Which protocol does REST APIs use?

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Authentication and Authorization

7. How Do You Secure a RESTful API?

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8. How does Basic Authentication work?

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9. How Do JWT Tokens Work in Securing REST APIs?

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10. What is OAuth2, and how is it used in REST APIs?

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11. What is the difference between HTTP and HTTPS?

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12. Is it possible to implement transport layer security (TLS) in REST?

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13. What are the advantages and disadvantages of using cookies for session management in a RESTful application?

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Design and Best Practices

14. What is the importance of resource naming conventions in REST APIs?

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15. How do you design RESTful APIs for pagination and filtering?

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16. What is HATEOAS, and how does it apply to REST APIs?

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17. What are the best practices for versioning REST APIs?

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18. How do you design an API to handle large file uploads?

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19. Is it possible to send a payload in the GET and DELETE methods?

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20. What are HTTP headers, and which ones are most commonly used?

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Error Handling and Logging

21. What are common error response structures in REST?

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22. How do you log API requests and responses effectively?

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Performance and Scalability

23. How do you implement rate limiting in a REST API?

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24. What is caching, and how can it improve REST API performance?

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25. How does the ETag header work in REST APIs?

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26. How can you trace individual requests across services?

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27. What is the role of API gateways in scaling REST APIs?

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28. Why are REST services easily scalable?

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29. What are the advantages and drawbacks of statelessness in REST?

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30. What is the maximum payload size that can be sent in POST methods?

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Testing REST APIs

31. How do you write integration tests for REST APIs?

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32. What is the difference between TestRestTemplate and MockMvc?

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33. What are the steps to implement contract testing while using a Pact Broker?

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Advanced Topics

34. What is GraphQL, and how does it compare to REST?

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35. How do you secure REST APIs against common vulnerabilities (OWASP Top 10) ?

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36. How do you handle async communication in REST APIs (e.g., Webhooks, Long Polling)?

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37. What is the role of the Jackson library in a Java REST API?

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Real-World Scenarios

38. How would you design a REST API for a shopping cart application?

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39. How do you implement multi-tenancy in a REST API?

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40. How do you migrate and deprecate endpoints in an evolving REST API?

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41. How do you document REST APIs effectively (e.g., Swagger/OpenAPI)?

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42. What is the role of content negotiation in REST APIs?

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43. If I have an endpoint /users, and I have 1k requests coming to this endpoint, are they run in parallel or sequential?

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