When constructing connection strings/URIs that embed user credentials, always URL-encode username/password (and other URI components as needed) using an encoder that safely handles reserved characters. Avoid `urllib.parse.quote` for credentials where characters like `@` and `#` may appear; prefer `quote_plus`. Example: ```python from urllib.parse import quote_plus db_url = ( f"doris://{quote_plus(user)}:{quote_plus(pwd)}@{host}:{port}/{db_name}" ) ``` This prevents malformed URIs and ensures credentials are interpreted correctly and securely by the client/driver.