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You can use this optional query parameter to describe a qualified ARN using a function version or an alias name. The permission will then apply to the specific qualified ARN. For example, if you specify function version 2 as the qualifier, then permission applies only when request is made using qualified function ARN:


If you specify an alias name, for example PROD, then the permission is valid only for requests made using the alias ARN:


If the qualifier is not specified, the permission is valid only when requests is made using unqualified function ARN.


Qualifier is referenced in 1 repository