I have an extremely simple routes.rb in my Rails app:
ActionController::Routing::Routes.draw do |map|
map.resources :tags
end
Starting up my app with script/server and pointing my browser to localhost:3000/tags/ yields:
ActionController::MethodNotAllowed
Only get and post requests are allowed.
...
Starting up my app with script/server webrick, however, solves the problem.
Later: in case it matters, I'm running Mongrel 1.1.5 on OSX 10.5.5.