If your Amazon S3 bucket is configured as a website endpoint, you can't configure CloudFront to use HTTPS to communicate with your origin because Amazon S3 doesn't support HTTPS connections in that configuration.

When your origin is an Amazon S3 bucket that supports HTTPS communication, CloudFront always forwards requests to S3 by using the same protocol of viewers requests.The default Protocol (custom origins only) is Match Viewer and can't be changed.

If require HTTPS between CloudFront and Amazon S3, you must change the value of Viewer Protocol Policy to Redirect HTTP to HTTPS or HTTPS Only.

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