def get(headers = {}, force = false)
      return @http_cache if @http_cache && !force
      response = make_request(:get, nil, headers)
      @http_headers = response.env['response_headers']
      @http_cache = response
    end
def get(headers = {}, force = false)
      return @http_cache if @http_cache && !force
      response = make_request(:get, nil, headers)
      @http_headers = response.env['response_headers']
      @http_cache = response
    end
Sends a GET request to #rdf_subject and caches the headers and body.
 Executes lazily unless `force` parameter is `true`, using cached values
 if present.

 @param headers [Hash<String, String>] a hash of HTTP headers;
   e.g. {'Content-Type' => 'text/plain'}.
 @param force [Boolean] force request if true

 @raise (see #make_request)
 @return [Faraday::Response] the server's response