    # File lib/rbot/core/utils/httputil.rb, line 609
      def head(uri, options = {}, &block) # :yields: resp
        opts = {:method => :head}.merge(options)
        begin
          resp = get_response(uri, opts, &block)
          # raise "http error #{resp}" if Net::HTTPClientError === resp ||
          #   Net::HTTPServerError == resp
          return resp
        rescue Exception => e
          error e
        end
        return nil
      end