def headers
      @headers ||= @raw_headers.inject({}) do |result, (key, value)|
        result.merge(key.split("-").map(&:capitalize).join("-") => value)
      end
    end
def headers
      @headers ||= @raw_headers.inject({}) do |result, (key, value)|
        result.merge(key.split("-").map(&:capitalize).join("-") => value)
      end
    end
### Qiita::Response#headers
 Returns response headers returned from API as a `Hash`.

 ```rb
 response.headers #=> { "Content-Type" => "application/json" }
 ```