code: func (c *C) JSON(status int, v interface{}) {
  	c.Writer.Header().Set(contentType, "application/json; charset=UTF-8")
  	c.Writer.WriteHeader(status)
  	if v == nil {
  		return
  	}
  
  	buf := bufPool.Get()
  	defer bufPool.Put(buf)
  
  	if err := json.NewEncoder(buf).Encode(v); err != nil {
  		panic(err)
  	}
  
  	c.Writer.Write(buf.Bytes())
  }
docs: //JSON response with application/json; charset=UTF-8 Content type