code: func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
  	r.WriteContentType(w)
  	ret, err := json.Marshal(r.Data)
  	if err != nil {
  		return err
  	}
  
  	var buffer bytes.Buffer
  	for _, r := range string(ret) {
  		cvt := string(r)
  		if r >= 128 {
  			cvt = fmt.Sprintf("\\u%04x", int64(r))
  		}
  		buffer.WriteString(cvt)
  	}
  
  	_, err = w.Write(buffer.Bytes())
  	return err
  }
docs: // Render (AsciiJSON) marshals the given interface object and writes it with custom ContentType.