code: def make_request_validator(request):
      
      verb = request.values.get('verb', '', type=str)
      resumption_token = request.values.get('resumptionToken', None)
  
      schema = Verbs if resumption_token is None else ResumptionVerbs
      return getattr(schema, verb, OAISchema)(partial=False)
docs: Validate arguments in incomming request.