What happens to a Set-Cookie on a 103? What happens to hints in a redirect chain?, i.e. 301 103 301 103 200 What headers are applicable to the 103 beyond Link

What happens to a Set-Cookie on a 103? What happens to hints in a redirect chain?, i.e. 301 103 301 103 200 What headers are applicable to the 103 beyond Link? If a 103 included Refresh, could this be used like a timeout (redirect after Refresh time if actual request did not respond?) This... > A server MAY use a 103 (Early Hints) response to indicate only some of the header fields that are expected to be found in the final response. ... implies that all possible HTTP headers from the final response may be in the 103. RFCs need less ambiguity, lest clients and servers start to fill in the gaps and have divergent behaviour.