Is the sending file on a public web server, or a private one that you control?

If it is a private server you can control, and it runs linux, then check out lsyncd, which piggybacks on rsync and the kernel file change callback hooks to keep files in sync between two machines.

In reply to Re: Keeping a local copy of a file up-to-date by chrestomanci
in thread Keeping a local copy of a file up-to-date by bontchev

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