pub const URL_SAFE: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";Expand description
URL-safe base64 alphabet — RFC 4648 §5. A-Z, a-z, 0-9, -,
_. 64 characters.
Safe to embed directly in URL paths and query strings without percent-encoding.