steveloughran commented on PR #15171:
URL: https://github.com/apache/iceberg/pull/15171#issuecomment-4006502947

   @danielcweeks my PR #15428 extends this PR with more tests of caching 
working.
   
   There is one alternative design which I propose there:
   
   when the client gets a cache-control: true response, it must parse the 
authorization header to identify the enumerated headers, and only include those 
in the cache.
   
   When the client has a request to sign, it does a lookup of the (method, uri, 
region) but doesn't treat a hit as sufficient. it has to check all the signed 
headers to verify that they are unchanged before reusing the signature.
   
   This meets your "server decides what to sign" requirement, but also 
satisfies amazon's requirement that "all signed headers must be valid". 
Currently that doesn't reliably hold.


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