title: CloudFront image cache-control headers
body: <p>1- Is this a valid cache control header:</p>
  
  <pre><code>Cache-Control: max-age=86400, s-maxage=3600
  </code></pre>
  
  <p>2- I am trying to set cache control headers for objects served from S3 through CloudFront. The images don't often change, but sometimes can. Does this seem like a good cache control for this? CloudFront should re-validate every 60 minutes, but the user will cache for a full day. (I'm less worried about an individual user and more worried about continuing to serve the stale image to new users).</p>
  
  <p>3- Are there other headers I should use? (ie. proxy-revalidate)</p>
  
  <p>Its not horrendously easy to change these settings on S3 objects so I'm trying to get it right the first time. Thanks.</p>