https://github.com/rails/rails/blob/c0bc9ce38c6528916f9dd440984a386511e4297d/actionpack/CHANGELOG.md 改了不少东东 Added controller-level etag additions that will be part of the action etag computation Etag will differ even for the same invoice when it's viewed by a different current_user 我喜欢 等会儿 整理一下