Rails, Cucumber: external redirection to another domain

Question

I have cucumber feature

...
Given I am on my domain page
When I press "send data to external domain"
Then I should be on the externel domain page
...

In production and development enviroments "My domain page" (www.example.com/mydomainpage) redirects user to "external domain page" (www.externaldomain.com/page). But in test enviroment cucumber cut off domain part of url:

Redirected to http://www.externaldomain.com/page
Completed 302 Found in 17895ms


Started GET "/page" for 127.0.0.1 at 2010-10-11 19:06:48 +0400
  SQL (72.0ms)  ROLLBACK

Is it possible to set up cucumber to redirect to various domain, not only current server domain?

P.S. Cucumber + Capybara + Rails + Rspec