steveloughran commented on issue #15417:
URL: https://github.com/apache/iceberg/issues/15417#issuecomment-3950949435

   Having drafted a PR I realise that some headers *must* be promoted to 
unsigned, specifically the if-match, if-none-match and version, as these may 
change for head/get requests on the same object.
   
   Encryption settings could also vary per fs instance, for any client actually 
setting them.
   
   Currently S3FileIO in iceberg-aws assumes all settings, including endpoint 
and auth are the same for every instance. If they aren't, whichever instance 
signs a request first grants access with that same signature to the same object 
to all other instance.


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