Currently, Play only has GzipFilter. To easily support modern compression algorithms like Brotli (br) or zstd without duplicating filter logic, it would be great to have an extensible encoding filter, something like

class ContentEncodingFilter(
  encodingName: String, 
  createFlow: () => Flow[ByteString, ByteString, _],
  shouldTranscode: (request: RequestHeader, result: Result) => Boolean,
)