  * provide axum feature "headers" when needed crate is in Debian
    * headers
  * provide axum feature "multipart"
    and axum-extra feature "multipart"
    when needed crate is in Debian
    * multer
  * provide axum feature "ws" when needed crate is in Debian
    * tokio-tungstenite
  * improve test coverage when needed crate is in Debian
    * tower-http
