docs: def _send_request(self, job_type, params={}):
          """
          Construct and submit a structured/authenticated request.
  
          ## Arguments
  
          * `job_type` (str): The job type identifier to use.
  
          ## Keyword Arguments
  
          * `params` (dict): Any additional entries to include in the POST
            request.
  
          ## Returns
  
          * `r` (requests.Response): The response from the server.
  
          """
          params["wsid"] = params.get("wsid", self.userid)
          params["pw"]   = params.get("pw", self.password)
  
          path = os.path.join(self.base_url, job_type)
          if self.request_type == 'GET':
              r = requests.get(path, params=params)
          elif self.request_type == 'POST':
              r = requests.post(path, data=params)
          else:
              raise ValueError('`resest_type` is invalid!')
  
          code = r.status_code
          if code != 200:
              raise Exception("%s failed with status: %d"%(job_type, code))
  
          return r