URIP-710 — Processing of %xx sequences in URI failed
Some forms of URI can use escaping of characters. An escaped character has the form %xx, where each 'x' is a hexadecimal number. Such URIs must be normalized before processing. In a normalized URI, exactly special characters which need escaping are escaped and all other characters are unescaped. If URI normalization fails (e.g., because of an invalid %xx sequence), this message is logged and the request fails.