我可以同时在Amazon S3存储桶中的所有对象上设置expires标头吗？

I've got about 200k images in a bucket. They all have expires headers of 2050 but I've read you shouldn't send an expires header older than a year. I want to schedule a script to run every month and set the headers to 6 months away. Anything out there? Obviously I'd like to avoid iterating 200k objects.I've got about 200k images in a bucket. They al