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We store our images on S3 and our performance has been incredibly slow. This morning we turned on CloudFront in hopes that our performance would increase. When I analyze our performance with Google's Dev Tools or YSlow, our site is still slow. Both tools recommend I set expire times so browsers cache the images. I looked in our .htaccess file, mod_expires is turned on with the following rules:

<IfModule mod_expires.c>
 Media: images, video, audio

  ExpiresByType image/gif                 "access plus 1 month"
  ExpiresByType image/png                 "access plus 1 month"
  ExpiresByType image/jpeg                "access plus 1 month"
  ExpiresByType video/ogg                 "access plus 1 month"
  ExpiresByType audio/ogg                 "access plus 1 month"
  ExpiresByType video/mp4                 "access plus 1 month"
  ExpiresByType video/webm                "access plus 1 month"
</IfModule>

Why are our images not being cached by the browser?

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    What actual response headers are your server sending and what values is it setting them to? i.e. Cache-Conrol, Date, ETag, etc...... You can use a tool like Fiddler2 to help you capture that data. – Mike May 2 '13 at 15:37
  • @Mike - I couldn't use Fiddler2 since I am on Mac but I did download Charles. This may sound crazy but the response header size was 0 bytes (the request header was 212bytes). Does this make sense? – hugo May 2 '13 at 16:55
  • Install firebug to catch the headers response, works on mac just fine. – Simon Hayter May 3 '13 at 19:41
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    Why are you editing an htaccess file on your server when the images are all stored on S3? – DisgruntledGoat May 22 '13 at 15:34
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You'll need to add the cache control headers using the S3 console as your Apache .htaccess only affects locally stored files.

Within the S3 console, go to the Properties -> Metadata section for each file you want to change Add Cache-Control, Expires & Last-Modified headers with appropriate values

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