dispatch

# File railties/lib/dispatcher.rb, line 35
    def dispatch(cgi = nil, session_options = ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS, output = $stdout)
      controller = nil
      if cgi ||= new_cgi(output)
        request, response = ActionController::CgiRequest.new(cgi, session_options), ActionController::CgiResponse.new(cgi)
        prepare_application
        controller = ActionController::Routing::Routes.recognize(request)
        controller.process(request, response).out(output)
      end
    rescue Exception => exception  # errors from CGI dispatch
      failsafe_response(output, '500 Internal Server Error', exception) do
        controller ||= (ApplicationController rescue ActionController::Base)
        controller.process_with_exception(request, response, exception).out(output)
      end
    ensure
      # Do not give a failsafe response here.
      reset_after_dispatch
    end