old_contents: from pymogilefs import backend
  from pymogilefs.request import Request
  
  
  class Client:
      def __init__(self, backend):
          self._backend = backend
  
      def _do_request(self, config, **kwargs):
          return self._backend.do_request(Request(config, **kwargs))
  
      def store_file(self, file_handle, key, domain, _class=None):
          kwargs = {'domain': domain,
                    'key': key,
                    'fid': 0,
                    'multi_dest': 1}
          if _class is not None:
              kwargs['class'] = _class
          response = self._do_request(backend.StoreFileConfig, **kwargs).items
          http_connection = HttpConnection(domain=self._domain,
                                           backend=self._backend)
          http_connection.put_file(file_handle=file_handle,
                                   uri=uri)
  
      def delete_file(self):
          raise NotImplementedError
  
      def rename_file(self):
          raise NotImplementedError
  
      def get_paths(self):
          raise NotImplementedError
  
      def list_keys(self, domain, prefix, after, limit):
          return self._do_request(backend.ListKeysConfig, domain=domain,
                                  prefix=prefix, after=after, limit=limit)
  
new_contents: from pymogilefs import backend
  from pymogilefs.request import Request
  
  
  class Client:
      def __init__(self, backend):
          self._backend = backend
  
      def _do_request(self, config, **kwargs):
          return self._backend.do_request(Request(config, **kwargs))
  
      def store_file(self, file_handle, key, domain, _class=None):
          kwargs = {'domain': domain,
                    'key': key,
                    'fid': 0,
                    'multi_dest': 1}
          if _class is not None:
              kwargs['class'] = _class
          response = self._do_request(backend.StoreFileConfig, **kwargs).items
          http_connection = HttpConnection(domain=self._domain,
                                           backend=self._backend)
          http_connection.put_file(file_handle=file_handle,
                                   uri=uri)
  
      def delete_file(self):
          raise NotImplementedError
  
      def rename_file(self):
          raise NotImplementedError
  
      def get_paths(self):
          raise NotImplementedError
  
      def list_keys(self, domain, prefix, after, limit):
          return self._do_request(backend.ListKeysConfig,
                                  domain=domain,
                                  prefix=prefix,
                                  after=after,
                                  limit=limit)
  
subject: Fix indentation