[[!comment format=mdwn
 username="http://joeyh.name/"
 ip="2001:4978:f:21a::2"
 subject="comment 2"
 date="2013-08-17T08:59:11Z"
 content="""
When it says \"arbitrary urls\", it means it. The only requirement is that the url be well formed and that wget or whatever command you have it configured to use via annex.web-download-command knows how to download it.

Update 2018: That used to be the case, but it's now limited by default to
http and https urls.
"""]]