API Gateway

Question 1

What is a Canary release?

Answer 1

It will instantiate instances of your stable lambda and your newly versioned lambda on the same stage. This is configured within your SAM.yaml file.

Question 2

Why would you get a preflight error message?

Answer 2

Because CORS is not enabled and/or you do not have the OPTIONS method setup within the gateway.

Question 3

What does setting the TTL give you?

Answer 3

It is the setting that determines how long your response cache will live (TimeToLive).
TTL=0 means caching is disabled.

Question 4

How can a client invalidate the cache and force the server to get fresh results?

Answer 4

Pass in the cache-control header with a value of max-age=0

Question 5

How do regulate who can invalidate the response cache?

Answer 5

Attach a policy to the IAM role of that user. This would in effect only allow certain clients to invalidate the cache verse every client.

Question 6

How do you throttle requests?

Answer 6

Add a usage plan.

Question 7

What does the burst limit tell me?

Answer 7

It is the maximum number of concurrent request that can be processed in a given period of time without returning 429 Too Many Request error.

https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-throttling.html

Question 8

What is the rate limit tell me?

Answer 8

The number of request that can be processed over a period of time.