Rails - Jul 2012 - Set requests' header inside spec/routing

I''m working on a Rails application having a REST API in JSON format and
versioned (according to this excellent Ryan''s cast:
http://railscasts.com/episodes/350-rest-api-versioning).

For instance, there is a spec/requests spec:

  require ''spec_helper''

  describe "My Friends" do
    describe "GET /my/friends.json" do
      it "should get my_friends_path" do
        get v1_my_friends_path, {}, {''HTTP_ACCEPT'' =>
''application/vnd.myapp+json; level=1''}
        response.status.should be(401)
      end
    end
  end

And it works well.
But (keeping this example) how can we write the routing spec? For
instance this spec isn''t correct:

  require ''spec_helper''

  describe "friends routing" do
    it "routes to #index" do
      get("/my/friends.json", nil, {''HTTP_ACCEPT''
=>
''application/vnd.myapp+json; level=1''}).
        should route_to({ action: "index",
                      controller: "api/v1/private/my/friends",
                          format: "json" })
    end
  end

...because `get` can take only 1 param.

I tried different ways (such as with request.headers[''Accept'']
or
@request.headers[''Accept'']... where request is undefined and
@request is
nil). I really don''t see how to do.

I''m on Ruby 1.9.3, Rails 3.2.6 and rspec-rails 2.11.0. Thanks.

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