ruby 4 asset fetching fails on production

Scenario: I'm uploading an image file to the server, when trying to access it, using curl, I'm getting it on every 2nd request. e.g curl http://ift.tt/1HGSsIW

When i am getting 200ok, i can see that i am having ETag, when it fails i can see X-Request-Id and X-Runtime.

this error happen only on the amazon pre production, on local machine i cannot reproduce it.