| base64url_encode | R Documentation | 
The base64url_encode functions are a variant of the standard base64. They are
specified in Section 5 of RFC 4648 as a URL-safe alternative. They use different symbols
for the 62:nd and 63:rd alphabet character and do not include trailing ==
padding.
base64url_encode(bin)
base64url_decode(text)
| bin | a binary blob to encode | 
| text | a base64url encoded string | 
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