The embedded documentation for ActionController#default_url_options() is incomplete, inaccurate or at least misleading. Applying it as shown to an application will cause the automated tests to fail on argument count mismatches. And other tests that check host in URLs may start failing if :host is overwritten. The patch below corrects both problems. It is against Rails 2.3.5. It probably also applies to earlier versions.
Jeffrey
--- base.rb~ 2009-11-28 17:56:00.000000000 -0600 +++ base.rb 2009-11-30 09:35:43.000000000 -0600 @@ -1062,8 +1062,8 @@ # Overwrite to implement a number of default options that all url_for-based methods will use. The default options should come in # the form of a hash, just like the one you would use for url_for directly. Example: