Which solution will meet these requirements?
Design a WebSocket API by using Amazon API Gateway. Host the application in Amazon Elastic Container Service (Amazon ECS) in a private subnet. Create a private VPC link for API Gateway to access Amazon ECS.
Design a REST API by using Amazon API Gateway. Host the application in Amazon Elastic Container Service (Amazon ECS) in a private subnet. Create a private VPC link for API Gateway to access Amazon ECS.
Design a WebSocket API by using Amazon API Gateway. Host the application in Amazon Elastic Container Service (Amazon ECS) in a private subnet. Create a security group for API Gateway to access Amazon ECS.
Design a REST API by using Amazon API Gateway. Host the application in Amazon Elastic Container Service (Amazon ECS) in a private subnet. Create a security group for API Gateway to access Amazon ECS.
Explanations:
A WebSocket API is not suitable for presenting RESTful interfaces to users, as it is primarily used for real-time, bidirectional communication. Since the requirement specifies the use of REST APIs, this option does not meet the needs of the application.
A REST API designed with Amazon API Gateway is appropriate for presenting the frontend of the application to users. Hosting the application in Amazon ECS within a private subnet ensures security, and creating a private VPC link allows API Gateway to securely access the backend services hosted in ECS. This solution meets all the requirements specified.
Similar to option A, a WebSocket API is not aligned with the requirement for REST APIs. Additionally, a security group alone does not provide the necessary capability for API Gateway to communicate with ECS; a VPC link is required. Thus, this option is not valid.
Although this option correctly identifies the use of a REST API, using a security group alone does not meet the requirements for accessing backend services in a private subnet. A private VPC link is necessary for API Gateway to connect to ECS securely, making this option insufficient.
As I understand it, the answer is:
Design a REST API by using Amazon API Gateway. Host the application in Amazon Elastic Container Service (Amazon ECS) in a private subnet. Create a private VPC link for API Gateway to access Amazon ECS.