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Explanation

AWS API Gateway acts as an entry point for clients calling backend APIs hosted on services such as EC2, Lambda, or containers.

Code:

Client Application
       |
       v
AWS API Gateway
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       v
Spring Boot REST API

Explanation

Create a simple Spring Boot REST controller that exposes an endpoint for retrieving employee information.

Code:

@RestController
@RequestMapping("/employees")
public class EmployeeController {

    @GetMapping
    public List<String> getEmployees() {
        return List.of("Praveen", "Arun", "Kumar");
    }
}

Explanation

Configure an API Gateway route that forwards incoming requests to the Spring Boot backend endpoint.

Code:

GET /employees
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      v
API Gateway
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      v
http://EC2_PUBLIC_IP:8080/employees

Explanation

API Gateway can provide authentication, throttling, request validation, monitoring, and API version management.

Code:

Client
  |
  v
API Gateway
  ├── Authentication
  ├── Throttling
  ├── Validation
  └── Routing
  |
  v
Spring Boot API

Explanation

The client should call the API Gateway URL instead of directly exposing the EC2 server endpoint to the public internet.

Code:

Client Request:
https://api.example.com/employees

API Gateway forwards the request to:
http://internal-spring-boot-service/employees