docs: def _delete_entity(partition_key, row_key, if_match):
      '''
       Constructs a delete entity request.
      '''
      _validate_not_none('if_match', if_match)
      _validate_not_none('partition_key', partition_key)
      _validate_not_none('row_key', row_key)
      request = HTTPRequest()
      request.method = 'DELETE'
      request.headers = [_DEFAULT_ACCEPT_HEADER,
                          ('If-Match', _to_str(if_match))]
  
      return request