MIME::Base64::URLSafe 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
