 headers
:param _preload_content: if False, the urllib3.HTTPResponse object will
                         be returned without reading/decoding response
                         data. Default is True.
:param _request_timeout: timeout setting for this request. If one
                         number provided, it will be total request
                         timeout. It can also be a pair (tuple) of
                         (connection, read) timeouts.
:return: tuple(V1EndpointSlice, status_code(int), headers(HTTPHeaderDict))
         If the method is called asynchronously,
         returns the request thread.
)rl