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AWS Developer Exam > API Gateway > Flashcards

API Gateway Flashcards

1
Q

What is API Gateway

A

Application Programming Interface Gateway. Fully managed service that. makes it easy for developers to publish, maintain, monitor or secure API. Easily create an API that acts as a “front door” for apps to access data, business logic or functionality from backend service.

  • Apps running on EC2
  • Code running on Lambda
  • Or any webapp
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2
Q

What kind of API does API Gateway support?

A

RESTful API.

Uses JSON

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3
Q

How does API Gateway prevent attacks

A

Throttles requests

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4
Q

What services can API Gateway connect to serverlessly?

A

Lambda

DynamoDB

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5
Q

Monitoring Service for API Gateway

A

CloudWatch

CloudWatch Logs

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6
Q

What is API Caching

A

API Gateway allow to cache endpoint response. This reduces the number of calls made to an endpoint and can improve latency of API requests. These caches have TTLs.

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7
Q

Describe Same Origin Policy

A

Web browser permits scripting contained in 1st webpage to access data on 2nd webpage (but only if webpages have the same orgin)

This is done to prevent cross-site scripting (XSS) attacks

Enforced by web browsers

Must set up CORS for this

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8
Q

What is CORS

A

Cross Origin Resource Sharing

relax same-origin policy

Broswer makes HTTP OPTIONS Orgin Policy error means need to connect CORS

If using JS/Ajax and use multiple domains w? API gateway ensure you have enabled CORS

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9
Q

Who enforces CORS

A

the client

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10
Q

How to import API from an external definition file into API Gateway

A

Swagger v2.0 definition file

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11
Q

How to create a new API with external definition file

A

submit POST request include Swagger definition in payload and endpoint config

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12
Q

How to update an existing API with external definition file

A

PUT request. Contain Swagger definition in payload.

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13
Q

How to specify options in API call

A

Add query param in request URL

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14
Q

Default limit steady state rate request API Gateway

A

10000 requests per sec (rps)

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15
Q

Max concurrent requests API Gateway

A

5000 across all APIs w/in AWS account

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16
Q

What happens if you go over the max steady state rate or concurrent request rate in API Gateway

A

receive a 439 TooManyRequestError response

17
Q

Can API Gateway support SOAP APIs

A

API Gateway can be configured as a SOAP web service passthrough

and

API Gateway can convert XML responses recieved from SOAP API to JSON

18
Q

What does it mean if you receive an HTTP 504 error in API Gateway

A

Integration Timeout

Could be a Lambda function is timing out (running for more than 29 seconds)

19
Q

How to make API available for certain environment (prod, test, dev)

A

API stage

20
Q

What 2 types of proxy integration are there in API Gateway

A

HTTP proxy

Lambda proxy

21
Q

What are common things that API Gateway can do

A

Execute Lambda code

Start Step Functions state machines

Call Elastic Beanstalk

Call EC2

Call web services outside AWS with HTTP endpoint

22
Q

How to run multiple versions of API at same time in API Gateway

A

API Lifecycle

23
Q

Does API Gateway support HTTP endpoints, HTTPS, or both?

A

Only HTTPS endpoints

24
Q

What service should you use if you want to trace and analyze user requests through API Gateway

A

AWS X-Ray

25
Q

What Integration Type should you use if you want Lambda proxy integration?

A

AWS_PROXY

26
Q

What Integration Type should you use if you want Lambda custom integration?

A

AWS

27
Q

What Integration Type should you use if you want HTTP (API GATEWAY) proxy integration

A

HTTP_PROXY

28
Q

What Integration type should you use if you want custom HTTP (APIGateway) integration?

A

HTTP

29
Q

Valid API Gateway Lambda Authorizers (2)

A

Token-based

Request parameter based (combo of headers, query string params, stageVariables and $context variables)

AWS Developer Exam (32 decks)

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