playframework/playframework — pull request #3359 by gmethvin (2014-09-17 10:31:23+00:00)
Title: Scala Cached Action Uses Bad ETAG

https://github.com/playframework/playframework/blob/master/framework/src/play-cache/src/main/scala/play/api/cache/Cached.scala#L75

That ETAG value is invalid.