Download file from website and save to disk

i'm trying downlaod images website , save them local drive, , can't seem work.  have isn't working:

 

var urlfile:file = new file(_dataxml.thumbnail.tostring()); // full http:// url file on server

var localfile:file = new file(gfolder + "\\" + _dataxml.file.tostring()); // user's folder , file name save to

urlfile.copyto(localfile, true);

 

is there way don't know about?  says can't find source file (the urlfile)

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