title: Cloudfront Won't Set Expiration Header from S3 Origin
body: <p>I am using an S3 bucket to store a bunch of product images for a large web site. These images are being served through Cloudfront with the S3 bucket as the origin. I have noticed that Cloudfront does not put an expiration header on the image even though I have set the distribution behavior to customize the cache headers and set a long min, max, and default TTL in Cloudfront.</p>
  
  <p>I understand that I can put an expiration on the S3 object, however this is going to be quite impractical as I have millions of images. I was hoping that cloudfront would do me the honors of adding this header for me, but it does not.</p>
  
  <p>So my question is the only way to get this expiration header to apply it every S3 object, or perhaps I am missing something in Cloudfront that will do it for me?</p>