Downloaded Image

For a free promotional game, I am trying to display a dynamic PNG image downloaded from a web server. Now I’m encountering some problems:
While in the simulator the image is displayed in its real size, on iOS the image is downscaled to a fixed max width (device limitation?), no matter its original resolution. This happens both when I use display.remoteimage and network.download + display.newimage.
My test device is jailbroken, iFile shows the image file itself preservers its original size. So it seems to have something to do with the image handling itself. Am I missing something? All other png images work flawless, it seems the downloaded file is scaled by a different ratio. Is there something I can do to force the original size?
[EDIT:] Yes, there is something, providing “true” as a parameter in display.newimage.

My main problem is that the image file seems to be cached somewhere. The script deletes the file and downloads it anew - checked with iFile, deletion works. But when I change the file on the server, the app still recreates the old file in the temp directory. Only reinstallation of the app fixes this problem. What am I missing?
[EDIT:] I fixed this one by sending server-side http headers to disable caching.

Yay, I worked out all my problems myself! [import]uid: 123517 topic_id: 25871 reply_id: 325871[/import]

Could you clarify:

“I fixed this one by sending server-side http headers to disable caching.”

Is this something that needs to be done on the server by the Sysadmin?

Could you clarify:

“I fixed this one by sending server-side http headers to disable caching.”

Is this something that needs to be done on the server by the Sysadmin?