fix: Fixed two bugs while testing. (Python 3.8.5)

[nicc777]

Tested on Ubuntu 20.04 with Python3

The dependencies:

• cffi==1.14.5
• click==7.1.2
• cryptography==3.4.7
• Flask==1.1.2
• itsdangerous==1.1.0
• Jinja2==2.11.3
• MarkupSafe==1.1.1
• pycparser==2.20
• PyJWT==2.1.0
• pyOpenSSL==20.0.1
• six==1.15.0
• Werkzeug==1.0.1

Only tested AC_PKCE examples thus far.

[nicc777]

I see PR #5 addresses the same issues in the AC example. So between these two PRs two examples are fixed.