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AWS API Gateway (cost (important factors (number of requests per month,…

- - - - what is this?
        
        it is ability to run multiple versions of API at the same time
        
        when we start working on API we perform multiple back and forth to same API. it provide facility to run multiple versions at the same time
      - benefits
        
        With this approach customer can still use version v1 and when they are sure then they can start using version two
    - - it enables monitoring based on latency, Errors, number of calls
      - These calls can further filtered based on stage,HTTP method and date range
    - - it help us to avoid writing multiple micro services just for different protocol
      - If our backend is not ready for new protocols then API gateway can handle these kind of requests.
      - Need to check if this feature is available in AWS
    - - based on
        
        A/B testing
        
        canary release
      - help us to do early testing of feature
      - Need to check if this feature is available in AWS API gateway
  - - - with this feature it will limit number of requests per seconds to API
      - if API receive more requests then client will receive HTTP 429 error
      - these limits available at API Gateway level and can further override at each method level
    - - what is this?
        
        this API key can be sent in http header
        
        it enable us to restrict clients based on their key
        
        when we enable API key then each client can have their own key.
      - what it is not?
        
        it is not used for authorization.anyone who has this key can send request to API Gateway
      - other benefits
        
        help us to track usage of API per client
        
        enable/disable access to client for usage of API
  - - - Caching of API enable us to reduce number of requests and improve performance
      - Can range from 0.5 GB till 237 GB
      - Additional bill will be charged
    - - with this feature it help avoid giving multiple API calls
      - API gateway can consolidate multiple API calls in single call
      - similar feature possible with facebook GraphQL framework
      - Need to check if this feature is available in AWS API gateway