amazon s3 - Is it possible to change headers on an S3 object without downloading the entire object?

Question

I've uploaded a bunch of images to Amazon S3, and now want to add a Cache-Control header to them.

Can the header be updated without downloading the entire image? If so, how?

Answer 1

It's beta functionality, but you can specify new meta data when you copy an object. Specify the same source and destination for the copy, and this has the effect of just updating the meta data on your object.

PUT /myObject HTTP/1.1
Host: mybucket.s3.amazonaws.com  
x-amz-copy-source: /mybucket/myObject  
x-amz-metadata-directive: REPLACE  
x-amz-meta-myKey: newValue