code: def get_callback_pattern(expected_params, actual_params):
          
          pattern = dict()
          key = 0
          for exp_param in expected_params:
              if exp_param[0] == '{' and exp_param[-1:] == '}':
                  pattern[exp_param[1:-1]] = actual_params[key]
              key = key + 1
          return pattern
docs: Assembles a dictionary whith the parameters schema defined for this route
          :param expected_params dict parameters schema defined for this route
          :param actual_params dict actual url parameters
          :rtype: dict