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Applications (SQS (Feature (SQS is pull based, not push based, message can…

- - - - doesn't response until message is arrive in the queue or long polling timeout
    - - return immediately even queue is empty
  - - - nearly unlimited transactions per second
      - try best-effort to delivered same order as they are sent (can be out of order)
    - - Complements Standard Queue
      - strictly ordered, message is delivered exactly once and remain available until consumer processes and delete
      - duplicated deliver message are not introduced (because message only deliver exactly once)
- - - - an application that start (init) workflow
    - - control the workflow of activity tasks, decide what to do next
    - - carry out activity tasks
- - - - permit scripts in one web page to access data in other web page as long as same origin (domain name)
    - - Allow restricted resources (ex. fonts) on a web page to be requested from another domain outside the domain from which the first resource was served
      - Error: "Origin policy cannot be read at the remote resource?" => need to enable CORS on API Gateway
  - - - Select HTTP methods (verbs)
      - Set security
      - Choose target (EC2, Lambda, DynamoDB...)
      - Set request/response transformation
- - - - Consists of Shards
      - Data is persistent on shards (24 hours up to 7 days)
    - - No data persistent storage
      - Data is analysed when it come in (for ex using Lambda) then output somewhere (for ex save to S3)
    - - analyse data inside Kinesis
      - analyse data inside both Kinesis Streams and Kinesis Firehose
- - - - User Pool
        
        user based, handle things like user registration, authentication, account recovery
        
        successful authentication generate JSON Web Tokens (JWTs)
      - Identity Pool
        
        enable to provide temporary AWS credentials to access AWS services like S3, DynamoDB...
        
        use JWT token to exchange AWS credentials
    - - use Push Synchronization to push updates and synchronize user across multiple devices (use SNS)