def parse_response!
      response.body = case @response_format
        when :xml then Hash.from_xml response.body
        when :json then JSON response.body
      end if response.body
    end
def parse_response!
      response.body = case @response_format
        when :xml then Hash.from_xml response.body
        when :json then JSON response.body
      end if response.body
    end
Replaces the body of the response with the parsed version of the body,
 according to the format specified in the Request.