Issue with caching in Apache

["Arnab Ganguly" <aganguly01@xxxxxxxxx>]

Hi All,
There is an issue I am getting.We are having a cache server and the main download server.Both are using Apache webserver.When the request from the client comes and if it is for the new file ,the request gets propagated to the main download server and next time onwards the request is being served from the Cache server itself.

Now issue is that this cache server being a 3rd party we don't have access to see the apache access_log or the configuration file. The behavior what we are observing is, from the browser when we are sending request to the caching server for  a particular file, it is being served properly and the file required to be downloaded is getting downloaded properly.

But when the request comes from the client for the download of the same file, the download happens but we get the download file size as 0.

So anybody if has come across the above issue and what was the work around it would be of great help to me.

Thanks in advance
-A