colinmarc opened a new pull request, #772:
URL: https://github.com/apache/opendal-reqsign/pull/772

   When signing requests, we currently only check that the credential is 
*currently* valid, but on some backends (for example AWS), the signature 
lifetime is capped to the credential lifetime. In those situations, we need to 
refresh credentials instead of using the cached ones.
   
   This is still best-effort; if the minimum expiry of the credential is less 
than the desired expiry of the signature, there's nothing we can do. We could 
change the signature of `is_valid_at` to return a potential error if the 
requested expiry is impossible to fulfill, up to you.


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