Ruby on Rails

Hello, I have to handle this exception:   HTTP 502: Response body: Got EOF while waiting for outstanding responses (Koala::Facebook::APIError)

and I have written this test:
it "should handle Koala's error" do
        get :test_action
        response.should redirect_to root_url
        flash[:alert].should == "HTTP 502: Response body: Got EOF while waiting for outstanding responses (Koala::Facebook::APIError)"
    end

The file in which is used graph.batch is in lib folder and since I can't use things like redirect_to or something else in these files I decided to handle this error writing rescue block in ApplicationController:

     rescue_from Koala::Facebook::APIError do |exception|
        redirect_to root_url, :alert => exception.message
    end

But then I though that maybe I should handle 502 error and in that case I only have to write 502.html file in public folder. Right?
Can someone help me with the right path to handle this error. Thanks in advance :)

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