code: def get_authorization_header():
      
      header = request.environ.get('HTTP_AUTHORIZATION')
  
      if not header:
          return None
  
      header = wsgi_to_bytes(header)
  
      try:
          auth_type, auth_info = header.split(None, 1)
          auth_type = auth_type.lower()
      except ValueError:
          return None
  
      return auth_type, auth_info
docs: Return request's 'Authorization:' header as
      a two-tuple of (type, info).