Last update：2022-02-09 14:03:40
URL-Safe Base64 Encoding is suitable for scenarios where Base64 encoded results are transferred with the URL method. The basic process of this encoding method is first encoding content into a character string in Base64 format, then checking the resultant character string, substituting hyphens (-) for the plus signs (+) in the character string, and substituting the underscores (_) for the forward slashes (/).
Basic Base64 alphabet
URL-optimized Base64 alphabet (Differences are marked in red and feature the complete same algorithmic processing procedure)
Algorithmic processing procedure
For the detailed encoding specifications, see the relevant descriptions in the RFC4648standard.