def render
      payload = font_string + @zpl
      response = Labelary::Client.connection.post "/v1/printers/#{@dpmm}dpmm/labels/#{@width}x#{@height}/#{@index}/", payload, { Accept: @content_type }
      return response.body
    end
def render
      payload = font_string + @zpl
      response = Labelary::Client.connection.post "/v1/printers/#{@dpmm}dpmm/labels/#{@width}x#{@height}/#{@index}/", payload, { Accept: @content_type }
      return response.body
    end
http://labelary.com/service.html