url_for does not automatically :only_path => false when :host is set

Specifically, docs for url_for claim :only_path defaults to false. However, setting :host without explicitly specifying :only_path => false results in a relative url.

That is:

url_for foo, :host => "bla.com"

... provides a relative path but ...

url_for foo, :host => "bla.com", :only_path => false

... provides an absolute path.

Er... replace "foo" with a controller and action. ;-)

More specifically, this only happens when using a named route helper. Using url_for directly works fine.

Please close this. Not a bug. Perhaps the documentation could use an update to remind people that url defaults to :only_path => false and path defaults to :only_path => true.