How can I use Rails routes to redirect from one domain to another?

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This works in Rails 3.2.3

constraints(:host => /foo.tld/) do
  match "/(*path)" => redirect {|params, req| "http://bar.tld/#{params[:path]}"}
end

This works in Rails 4.0

constraints(:host => /foo.tld/) do
  match "/(*path)" => redirect {|params, req| "http://bar.tld/#{params[:path]}"},  via: [:get, :post]
end

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