If you don't configure your origin to add a Cache-Control max-age directive or an Expires header, DefaultTTL is the default amount of time (in seconds) that an object is in a CloudFront cache before CloudFront forwards another request to your origin to determine whether the object has been updated. The value that you specify applies only when your origin does not add HTTP headers such as Cache-Control max-age, Cache-Control s-maxage, and Expires to objects. You can specify a value from 0 to 3,153,600,000 seconds (100 years).
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// * IllegalUpdate