We currently want to start hosting all our assets through AWS S3 and we also want to server everything over https. I understand I can use the Amazon Certificate Manager (ACM
Unfortunately you can't use an SSL certificate with your custom domain with S3. You can use the S3 domain with the Amazon SSL certificate like: https://my-example-bucket.s3-website-us-east-1.amazonaws.com
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If you want to use a custom domain with SSL, and you can't use CloudFront, then you will need to look into placing some other proxy in front of S3 like your own Nginx server or something.