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Editorial Team
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Asked: 2026-05-23T15:13:16+00:00

This is the code: >>> import base64 >>> id = 1 >>> key =

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This is the code:

>>> import base64
>>> id = 1
>>> key = "secret key very long"
>>> enc = base64.urlsafe_b64encode(str(id)+key)
>>> enc
'MXNlY3JldCBrZXkgdmVyeSBsb25n'
>>> base64.urlsafe_b64decode(enc)
'1secret key very long'

Works as intended on my machine, but when I upload this code to google appengine, both encoded and decoded strings are totally different. How come?

EDIT 1:
this is the actual code:

import base64
id = 18005
key = "r-$b*8hglm+858&9t043hlm6-&6-3d3vfc4((7yd0dbrakhvi"
enc = base64.urlsafe_b64encode(str(id)+key)
print enc
# local machine: MTgwMDVyLSRiKjhoZ2xtKzg1OCY5dDA0M2hsbTYtJjYtM2QzdmZjNCgoN3lkMGRicmFraHZp
# appengine: PXItJGIqOGhnbG0rODU4Jjl0MDQzaGxtNi0mNi0zZDN2ZmM0KCg3eWQwZGJyYWtodmkxODAwNQ==
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1 Answer

  1. Editorial Team

    I can’t explain why per se, but decoding the string you got from appengine shows it prepended an ‘=’ to your key; and appended, rather than prepended, the ID.

    >>> key='r-$b*8hglm+858&9t043hlm6-&6-3d3vfc4((7yd0dbrakhvi'
>>> base64.urlsafe_b64decode('PXItJGIqOGhnbG0rODU4Jjl0MDQzaGxtNi0mNi0zZDN2ZmM0KCg3eWQwZGJyYWtodmkxODAwNQ==')
'=r-$b*8hglm+858&9t043hlm6-&6-3d3vfc4((7yd0dbrakhvi18005'
>>> '=' + key + str(18005) == _
True

    are you absolutely sure you used the same code on the server?

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