Need help - How to check online status of file?

Hi.
I'd like to make my flash app checks whether a particular file is online.
Let's say this file is 1MB. How do I make it so that when the flash app checks the URL of the file, it won't download the whole thing?
That is, once the flash app confirms that the file is up, it immediately cancels the download and displays a status message that the file is up. And if there's a 4xx or 5xx message, it will report appropriately.
I'm a total newbie, so I don't know how to go about this. I'd appreciate it if you could point me in the right direction.
Thanks.

you can use the filereference class'es download() method and its listener's onProgress() method.

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