code: func (c *Ctx) XMLBytes(code int, b []byte) (err error) {
  
  	c.response.Header().Set(ContentType, ApplicationXMLCharsetUTF8)
  	c.response.WriteHeader(code)
  
  	if _, err = c.response.Write([]byte(xml.Header)); err == nil {
  		_, err = c.response.Write(b)
  	}
  
  	return
  }
docs: // XMLBytes returns provided XML response with status code