docs: def get(self):
          """
          :return: A string containing the TSV result from SSOS
          :rtype: str
          :raise: AssertionError
          """
          params = self.param_dict_builder.params
          logger.debug(pprint.pformat(format(params)))
          response = requests.post(SSOS_URL,
                                   data=params,
                                   headers=self.headers)
          logger.debug(response.url)
          assert isinstance(response, requests.Response)
          assert (response.status_code == requests.codes.ok)
  
          lines = response.content
          # note: spelling 'occured' is in SSOIS
          if len(lines) < 2 or "An error occured getting the ephemeris" in lines:
              print lines
              print response.url
              raise IOError(os.errno.EACCES,
                            "call to SSOIS failed on format error")
  
          if os.access("backdoor.tsv", os.R_OK):
              lines += open("backdoor.tsv").read()
          return lines