Urubu version 0.8 and higher
The urubu serve command takes the baseurl setting automatically into
account.
Urubu version 0.7
The urubu serve server does not include the baseurl prefix when serving
pages so sites that use baseurl can't be previewed locally using urubu
serve. An alternative option is to use
tservice, which includes an option to
serve a local static site with a URL prefix. To use tservice with an Urubu
site instead of using urubu serve call tserve with the prefix option, e.g.
tserve --prefix <baseurl> _build
Where <baseurl> is your site's particular prefix.