docs: def _get_entity(partition_key, row_key, select, accept):
      '''
      Constructs a get entity request.
      '''
      _validate_not_none('partition_key', partition_key)
      _validate_not_none('row_key', row_key)
      _validate_not_none('accept', accept)
      request = HTTPRequest()
      request.method = 'GET'
      request.headers = [('Accept', _to_str(accept))]
      request.query = [('$select', _to_str(select))]
  
      return request