Have you looked at FlashFXP's help file?
Quote:
This enables Copy URL to copy a http:// url to the clipboard by mapping the ftp folder to a HTTP server, presuming server is also running a HTTP server.
HTTP URL
Enter the full HTTP URL for the HTTP file server e.g. http://server.com
Server Web Root Path
Enter the root path for the HTTP file server.
Typically this would be something like /home/<user>/public_html/
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