A cache hit refers to the situation wherein the cache is able to successfully retrieve data and content that was saved to it, and then display it on a web page
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/cache-hit-ratio.html
Specifying how long CloudFront caches your objects
Using Origin Shield
Caching based on query string parameters
Caching based on cookie values
Caching based on request headers
Remove Accept-Encoding header when compression is not needed
Serving media content by using HTTP
Increase the CloudFront time to live (TTL) settings in the Cache Behavior Settings.
Ensure that only required cookies, query strings, and headers are forwarded in the Cache Behavior Settings.
By default, each file automatically expires after 24 hours
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Expiration.html
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-values-specify.html#DownloadDistValuesCacheBehavior
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