Set Response Status Code - RESTful Web Services with Spring framework | Spring Boot

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Setting Response Status Codes Effortlessly

Communication is key in any RESTful Web Service. In this tutorial, we demonstrate how to explicitly set HTTP Response Status Codes in Spring Boot using the ResponseEntity class, ensuring your API provides clear feedback to its clients.

Working with ResponseEntity

The ResponseEntity object allows you to wrap your response body and define a specific status code for every scenario. We walk through a practical example using an Employee entity and a RestController:

• Returning 200 OK: See how to return a successful status code along with the requested data when a valid ID is provided.
• Handling 400 Bad Request: Implementing logic to catch invalid inputs and return a proper error status code instead of a generic failure.
• Dynamic Logic: Learn how to use simple if-else blocks within your controller to determine the best response for the client.

Practical Demonstration

Using Postman, we test our endpoints in real-time. You'll observe how the API behaves differently when an ID is less than 10 compared to when it's 200, allowing you to see the 200 OK and 400 Bad Request responses in action within the tool.

Why This Matters

Setting specific status codes is a best practice in REST API development. It makes your backend more predictable and allows frontend clients or other services to handle results logically without parsing the entire response body. Mastering this in Spring Boot is a huge step toward building professional-grade web services.

📥 Get the Java Source Code!

The full Java source code for this tutorial is available for download! You can find the links in the YouTube video description above.