A string of at least 1 and a maximum of 255 octets in size, and it MUST only contain
characters from the “URL and Filename Safe” base64 alphabet, as defined in Section 5
of RFC 4648, excluding the pad character
(=). This means the allowed characters are the ASCII alphanumeric characters
(A-Za-z0-9), hyphen (-), and underscore (_).
A string of at least 1 and a maximum of 255 octets in size, and it MUST only contain characters from the “URL and Filename Safe” base64 alphabet, as defined in Section 5 of RFC 4648, excluding the pad character (
=). This means the allowed characters are the ASCII alphanumeric characters (A-Za-z0-9), hyphen (-), and underscore (_).