Base64url and Base64 facebook

Posted by Shekhar_Pro on Stack Overflow See other posts from Stack Overflow or by Shekhar_Pro
Published on 2010-12-22T07:35:44Z Indexed on 2010/12/22 7:54 UTC
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c#

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facebook

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url

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encoding

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base64

I have actually 2 questions:

1)What is the difference between base64url encoding and base64 encoding and

2)How base64url encode is different from Facebooks base64url encode because facebook mentions that it sends url in a form of base64url but with no padding and two different characters. http://developers.facebook.com/docs/authentication/canvas (under Why Sign calls)

Can anyone plese provide a pseudocode with explaination for converting to and from each other.

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