TypeError: Incorrect padding

[codingisacopingstrategy]

The vanilla example app balks for me

Might this be related to the new signed_request?
That’s what this Stack Overflow article seems to suggest

http://stackoverflow.com/questions/3302946/how-to-base64-url-decode-in-python

But I can’t really wrap my had around it.

Thanks,

Traceback (most recent call last):
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1306, in __call__
    return self.wsgi_app(environ, start_response)
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1294, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1292, in wsgi_app
    response = self.full_dispatch_request()
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1062, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1060, in full_dispatch_request
    rv = self.dispatch_request()
  File "/app/lib/python2.7/site-packages/flask/app.py", line 1047, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/app/exampleapp.py", line 167, in index
    access_token = get_token()
  File "/app/exampleapp.py", line 134, in get_token
    data = json.loads(urlsafe_b64decode(str(encoded_data[1])))
  File "/usr/local/lib/python2.7/base64.py", line 112, in urlsafe_b64decode
    """
  File "/usr/local/lib/python2.7/base64.py", line 76, in b64decode
    # Transform this exception for consistency
TypeError: Incorrect padding

[ptrklly]

I also ran into this problem, both by starting an app within Facebook and and starting one within Heroku.

[steffi2392]

I'm having the same problem - has anyone resolved this?

[wangtzINT]

Try to correct this line by

data = json.loads(urlsafe_b64decode(str(encoded_data[1]) + (64-len(encoded_data[1])%64)*"="))

This one works on my side.

[jacinda]

@wangtz That works for me too. This occurred for me after changing the automatically generated name from Heroku to something easier to remember (i.e. changing furious-robot-218.herokuapp.com to my-test-app.herokuapp.com).

[ifty]

facing the padding problem....if any body get out of that please post here the solutio

After implementing this fix, when I access my app at #myappname#.herokuapp.com it works fine,
but when I access it at http://apps.facebook.com/#mynamspace#, the canvas is blank.

When I go backwards and change this:

data = json.loads(urlsafe_b64decode(str(encoded_data[1]) + (64-len(encoded_data[1])%64)*"="))

back to this:

data = json.loads(urlsafe_b64decode(str(encoded_data[1])))

then the error I had in the beginning is printed on the canvas (at least the canvas is not mysteriously blank). How to fix this?