API Gateway REST APIs

5 minutes 5 Questions

API Gateway REST APIs are a core concept in Amazon API Gateway, allowing users to create, publish, and maintain secure REST and WebSocket APIs for their applications. It provides a complete management system for version control, security, access control, caching, logging, and monitoring. API Gateway directly integrates with other AWS services such as AWS Lambda, allowing the creation of serverless applications. The REST API can be easily customized to provide specific data transformations, validations, and request/response mapping.

Amazon API Gateway REST APIs Guide

What is Amazon API Gateway REST APIs?
Amazon API Gateway REST APIs is a service provided by Amazon Web Services that allows developers to create, publish, maintain, monitor, and secure REST APIs at any scale. This feature plays a pivotal role in managing and handling the APIs that approach AWS services, AWS Lambda, or any web applications.

Why is it vital?
API Gateway REST APIs is important because it enables developers to easily establish the access and management criteria for their APIs. It takes care of everything, ranging from traffic management, authorization and access control, monitoring to API version management.

How does it work?
It works as a front-door, enabling HTTP/HTTPS requests to be routed to several types of back-ends, including workloads running on Amazon Elastic Compute Cloud (EC2), code running on AWS Lambda, etc. It can handle virtually thousands of concurrent API calls, including traffic management, request verification, and request response processing.

Exam Tips: Answering Questions on API Gateway REST APIs
1. Understand the fundamental concepts: Have a clear understanding of how Amazon API Gateway REST APIs work and their importance.
2. Use of different types of back-ends: Be clear on how Amazon API Gateway REST APIs route to multiple types of back-ends.
3. Scale and Performance: Understand that API Gateway REST APIs can manage a high number of concurrent API calls, its traffic management, request verification, and response processing capabilities.
4. Functionality: Remember that it also serves as an intercessor for all kinds of requests from clients to services.

Test mode:

Exam (Timed)

Practice (With explanations)

Start practice test

Question 1

You want to improve the performance of your API Gateway REST API by compressing the payload in responses. What should you do?

Enable gzip compression in the Lambda function. Use Amazon S3 to store compressed responses. Create a CloudFront distribution for the API. Enable gzip compression on a specific stage of the REST API.

Correct Answer: Enable gzip compression on a specific stage of the REST API.

To compress the payload in API Gateway REST API responses, you should enable gzip compression at the specific stage of the REST API. This allows API Gateway to automatically compress the payload of your responses using gzip, thus improving the API's performance.

Question 2

You have an API Gateway REST API that processes incoming requests and integrates with an AWS Lambda function. You need to enable caching to reduce the processing time of your requests. What should you do?

Enable caching on individual methods. Enable caching using Lambda environment variables. Create a CloudFront distribution. Enable caching on a stage and define cache key parameters.

Correct Answer: Enable caching on a stage and define cache key parameters.

To enable caching in API Gateway REST APIs, you need to enable it at the stage level and specify cache key parameters to define a unique caching key. API Gateway will cache the response of your requests based on these key parameters, reducing the processing time for subsequent requests with the same key parameter values.

Question 3

You are building a REST API using API Gateway that will integrate with an existing Amazon EC2 instance running your web application. What is the appropriate integration type to allow API Gateway to communicate with your EC2 instance?

HTTP or HTTP_PROXY integration. VPC link. Lambda integration. AWS service-proxy integration.

Correct Answer: HTTP or HTTP_PROXY integration.

To create a REST API with API Gateway that integrates with an Amazon EC2 instance, you should use HTTP or HTTP_PROXY integration. This integration allows API Gateway to forward requests and receive responses from your instance using the HTTP or HTTPS protocol.

Go Premium