Which solution will meet these requirements?
Configure the CloudFront cache. Update the application to return cached content based upon the default request headers.
Override the cache method in the selected stage of API Gateway. Select the POST method.
Save the latest request response in Lambda /tmp directory. Update the Lambda function to check the /tmp directory.
Save the latest request in AWS Systems Manager Parameter Store. Modify the Lambda function to take the latest request response from Parameter Store.
Explanations:
Configuring CloudFront to cache based on request headers won’t effectively cache POST requests, as POST requests typically contain a request body that can vary, which prevents caching. Additionally, caching POST responses is not standard practice.
API Gateway allows you to configure caching for specific methods, including POST. By overriding the cache settings for the POST method, you can cache responses based on request parameters or headers, thereby optimizing resource usage and improving response times for repeated queries.
Saving the latest request response in the Lambda/tmpdirectory would not effectively share cached data across multiple Lambda invocations or users. The/tmpdirectory is not persistent and is limited to a single execution environment, so it cannot serve as a reliable caching mechanism for API responses.
Using AWS Systems Manager Parameter Store to store the latest request response is not efficient for caching purposes. Parameter Store is designed for configuration management and does not provide the performance benefits or capabilities of a cache. Additionally, it is not suited for high-frequency requests typical of API use cases.
I reckon the answer is:
Override the cache method in the selected stage of API Gateway. Select the POST method.