I have an IPad Safari sending two HTTP requests (two different PNG) files within 30 ms.
I thought that even on a Keep Alive HTTP 1.1 connection there should be a clear
I think that this may be due to browser adhering to HTTP 1.1 Spec 8.2.4. which does allow client to retry the request if client is connected to server thru a middle layer and doesn't get a response from server before the connection is closed.
I have seen this error and have found following links to be helpful.
https://www.ravellosystems.com/blog/beware-http-requests-automatic-retries/
http://geek.starbean.net/?p=393