docs: def _get(self, url):
          """Make a get request against the charmstore.
  
          This method is used by other API methods to standardize querying.
          @param url The full url to query
              (e.g. https://api.jujucharms.com/charmstore/v4/macaroon)
          """
          try:
              response = requests.get(url, verify=self.verify,
                                      cookies=self.cookies, timeout=self.timeout,
                                      auth=self._client.auth())
              response.raise_for_status()
              return response
          except HTTPError as exc:
              if exc.response.status_code in (404, 407):
                  raise EntityNotFound(url)
              else:
                  message = ('Error during request: {url} '
                             'status code:({code}) '
                             'message: {message}').format(
                                 url=url,
                                 code=exc.response.status_code,
                                 message=exc.response.text)
                  logging.error(message)
                  raise ServerError(exc.response.status_code,
                                    exc.response.text,
                                    message)
          except Timeout:
              message = 'Request timed out: {url} timeout: {timeout}'
              message = message.format(url=url, timeout=self.timeout)
              logging.error(message)
              raise ServerError(message)
          except RequestException as exc:
              message = ('Error during request: {url} '
                         'message: {message}').format(
                             url=url,
                             message=exc)
              logging.error(message)
              raise ServerError(exc.args[0][1].errno,
                                exc.args[0][1].strerror,
                                message)