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Applications, API Gateway, Simple Notification Service, Kinesis101, SQS,…

- - - - Enforced by web browsers
      - Ignored by tools like PosMan and curl
- - - - Amazon SQS offers standard as the default queue type. A standard queue lets you have a nearly-unlimited number of transactions per second. Standard queues guarantee that a messages is delivered at least once.
      - Occasionally (because of the highly-distributed architecture that allows high throughput), more than one copy of a message might be delivered out of order
      - However, standard queues provide best-effort ordering which ensures that messages are generally delivered in the same order as they are sent
  - - - The FIFO queue complements the standard queue
      - The most important features of this queue type are FIFO delivery and exactly once processing the order in which messages are sent and received is strictly preserved and a message is delivered once and remains available until a consumer processes and deletes it; duplicates are not introduced into the queue
      - FIFO queues also support message groups that allow multiple ordered messages groups within a single queue
      - FIFO queues are limited to 300 transactions per second (TPS), but have all the capabilities of standard queues
- - - - for Web Identity Federation using social media accounts like Facebook