• Add crate feature experimental-io-uring, enabling async file I/O to be utilized. This feature is only available on Linux OSes with recent kernel versions. This feature is semver-exempt. #2408
• Add NamedFile::open_async. #2408
• Fix 304 Not Modified responses to omit the Content-Length header, as per the spec. #2453
• The Responder impl for NamedFile now has a boxed future associated type. #2408
• The Service impl for NamedFileService now has a boxed future associated type. #2408
• Add impl Clone for FilesService. #2408