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POAmazon Cloudfront: private content but maximise local browser caching
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copied!<p>For JPEG image delivery in my web app, I am considering using Amazon S3 (or Amazon Cloudfront if it turns out to be the better option) but have two, possibly opposing, requirements:</p> <ol> <li>The images are private content; I want to use signed URLs with short expiration times.</li> <li>The images are large; I want them cached long-term by the users' browser.</li> </ol> <p>The approach I'm thinking is:</p> <ol> <li>User requests www.myserver.com/the_image</li> <li>Logic on my server determines the user is allowed to view the image. If they are allowed...</li> <li>Redirect the browser (<code>is HTTP 307 best ?</code>) to a signed Cloudfront URL</li> <li>Signed Cloudfront URL expires in 60 seconds but its response includes "<code>Cache-Control max-age=31536000, private</code>"</li> </ol> <p>The problem I forsee is that the next time the page loads, the browser will be looking for www.myserver.com/the_image but its cache will be for the signed Cloudfront URL. My server will return a different signed Cloudfront URL the second time, due to very short expiration times, so the browser won't know it can use its cache.</p> <p><strong>Is there a way round this without having my webserver proxy the image from Cloudfront (which obviously negates all the benefits of using Cloudfront)?</strong></p> <p>Wondering if there may be something I could do with <code>etag</code> and <code>HTTP 304</code> but can't quite join the dots...</p>

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