> api.new(request_method, rack_request, options).response
> .response returns a valid rack response [status, headers, body].

> Body is an instance of the api, and it its implementation is like this
> (simplified version):

> def initialize
> ...
> @proxy_connection = Net::HTTP.start(proxied_uri.host,
> proxied_uri.port)
> @proxy_connection.request(@proxy_request) do |response|
> @proxy_response = response
> end
> end

> def each(&block)
> @proxy_response.read_body(&block)
> end

> def to_s
> @proxy_response.read_body
> end
> The rack app can then call the proxied service with a full response
> with to_s, or as a streaming and receive the response in chunks with
> each.

> The thing is, when I return the response in rack, I'm getting the
> following stack trace: https://gist.github.com/1879724

> Apparently, the server or rack is calling 'each' more than once, but
> I'm not sure what might be causing it.

> The Rack app is running under rails 3.2.1.