class Faraday::Adapter::EMHttp

def perform_single_request(env)
  req = create_request(env)
  req.setup_request(env[:method], request_config(env)).callback { |client|
    status = client.response_header.status
    reason = client.response_header.http_reason
    save_response(env, status, client.response, nil, reason) do |resp_headers|
      client.response_header.each do |name, value|
        resp_headers[name.to_sym] = value
      end
    end
  }
end