code: def _users_from_environ(env_prefix=''):
      
      auth_string = os.environ.get(env_prefix + 'WSGI_AUTH_CREDENTIALS')
      if not auth_string:
          return {}
  
      result = {}
      for credentials in auth_string.split('|'):
          username, password = credentials.split(':', 1)
          result[username] = password
      return result
docs: Environment value via `user:password|user2:password2`