API Gateway Caching

5 minutes 5 Questions

API Gateway Caching is a performance improvement feature in Amazon API Gateway that allows caching of responses from REST and WebSocket APIs to reduce latency and improve processing speed. API Gateway Caching can be set up at different stages, allowing for separate cache settings and sizes for different environments like development or production. Cache settings can be customized based on desired caching behavior, time-to-live (TTL) values, and response sizes, providing an optimal balance between performance improvements and costs. API Gateway Caching helps to minimize the load on backend systems and improves performance for end users.

Guide to Amazon API Gateway Caching

API Gateway Caching is a powerful feature provided by AWS to improve the performance of your APIs and save backend systems from heavy loads.

What is API Gateway Caching?
It works by storing responses from your backend systems and reusing them for a period, instead of forwarding every request to your backend services. This is especially useful to prevent overloading of your services and improve latency.

Why it is important?
With caching, you reduce the amount of requests to your backend services, which can significantly reduce the costs of running your applications. Moreover, cached responses are returned faster, which improves the user experience.

How does it work?
When a request is made, API Gateway checks if a valid cached response is available. If so, it returns the cached response, otherwise it forwards the request to the backend and caches the response for future use.

Exam Tips: Answering Questions on API Gateway Caching
1. Understand how caching works and its benefits.
2. Be aware that caching can reduce costs and improve performance.
3. Keep in mind that cache settings can be customized, including encryption, TTL (Time to Live) and capacity.
4. Understand that not all responses are cacheable; AWS uses standard HTTP protocols to determine cacheability.
5. Remember that you may need to clear the cache manually if your backend responses change and should be refreshed immediately.
6. Note that caching in API Gateway is different from CloudFront caching, and both can be used together.

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Question 1

An organization wants to cache the response for variable path parameters in their API Gateway. which method can be used?

Enable caching on path parameters Increase cache capacity Enable caching on query string parameters Use regional API caching

Correct Answer: Enable caching on path parameters

By enabling caching on path parameters, the API Gateway can cache responses specific to variable path parameters. Increased cache capacity, caching on query string parameters or headers, regional API caching, and longer cache TTL don't directly cache variable path parameters.

Question 2

A company is concerned about the cost of API Gateway caching. What parameter can they control to reduce the caching cost?

VPC Link Cache time-to-live (TTL) API Versioning Edge Optimizations

Correct Answer: Cache time-to-live (TTL)

Controlling cache time-to-live (TTL) allows you to set how long the cached data is retained, thus managing freshness and cost. Other options like Edge Optimizations, API Versioning, VPC Link, AWS WAF, and CORS are not directly related to caching cost management.

Question 3

A company wants to use API Gateway to manage their RESTful APIs. Their APIs must provide faster response times for the most frequently requested data. What API Gateway feature should they enable?

Cache AWS WAF Canary Release Edge Optimizations

Correct Answer: Cache

Enabling cache increases response times by caching the most frequent requested endpoints. Canary releases, AWS WAF, Edge Optimizations, VPC Links, and CORS are not specifically for improving response times.

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