code: func appendResponseCookieBytes(dst []byte, cookies []argsKV) []byte {
  	for i, n := 0, len(cookies); i < n; i++ {
  		kv := &cookies[i]
  		dst = append(dst, kv.value...)
  		if i+1 < n {
  			dst = append(dst, ';', ' ')
  		}
  	}
  	return dst
  }
docs: // For Response we can not use the above function as response cookies
  // already contain the key= in the value.