Add test for content-length

Author: waterlink

spec/rack/reverse_proxy_spec.rb

@@ -119,6 +119,13 @@ def app
       expect(headers["x-additional-info"]).to be_nil
     end
 
+    it "the response header includes content-length" do
+      body = 'this is the test body'
+      stub_request(:any, 'example.com/test/stuff').to_return(:body => body, :headers => {'Content-Length' => '10'})
+      get '/test/stuff'
+      expect(last_response.headers['Content-Length']).to eq(body.length.to_s)
+    end
+
     describe "with non-default port" do
       def app
         Rack::ReverseProxy.new(dummy_app) do