php - How S3 putObject "expires" works? -


s3's putobject method aws sdk php states can pass expires parameter specifies

the date , time @ object no longer cacheable.

i'm confused that... mean exactly?

i thought object's bucket, key , url stays same forever.

that info used cloudfront know how long cache objects s3. or if serving static website s3 without cloudfront, used browsers determine how long cache file in local browser cache.


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