Hi guys,
I was performing pingdom's speed tests on my landers hosted on Amazon S3 and distributed by Cloudfront.
I got two issues:
1. "Leverage browser caching":
it asks me to specify an expiration at least one week in the future for the some resources.
I followed the tutorial
http://docs.aws.amazon.com/AmazonClo...onDownloadDist
I set one month expiration (in seconds) for every file, but I did not solve this error.
2. "Specify a Vary: Accept-Encoding header":
it says that my lander "publicly cacheable, compressible resources should have a "Vary: Accept-Encoding" header"...
Here I have no clue on how to proceed. 
any advice will be very appreciated.