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This module is a perl version of python's URL-safe base64 encoder
/ decoder.
When embedding binary data in URL, it is preferable to use base64
encoding. However, two characters ('+' and '/') used in the standard
base64 encoding have special meanings in URLs, often leading to
re-encoding with URL-encoding, or worse, interoperability problems.
To overcome the problem, the module provides a variation of base64
codec compatible with python's urlsafe_b64encode / urlsafe_b64decode.
Modification rules from base64:
use '-' and '_' instead of '+' and '/'
no line feeds
no trailing equals (=)
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