code: func Encode(data []byte) string {
  	result := base64.StdEncoding.EncodeToString(data)
  	result = strings.Replace(result, "+", "-", -1) // 62nd char of encoding
  	result = strings.Replace(result, "/", "_", -1) // 63rd char of encoding
  	result = strings.Replace(result, "=", "", -1)  // Remove any trailing '='s
  	
  	return result
  }
docs: // Encode encodes given byte array to base64url string