Function base64_url::encode_to_vec

pub fn encode_to_vec<'a, T: ?Sized + AsRef<[u8]>>(
    input: &T, 
    output: &'a mut Vec<u8>
) -> &'a [u8]

Encode data to Base64-URL data and directly store to a mutable Vec<u8> reference by concatenating them and return the slice of the Base64-URL data. It is usually for generating a URL.