proc getContentBody(r: HttpRequestRef): InternalRaisesFuture[
    Option[ContentBody], (CancelledError, HttpTransportError, HttpProtocolError,
                          RestBadRequestError)] {....stackTrace: false, raises: [],
    gcsafe, raises: [], tags: [RootEffect], forbids: [].}

proc processRestRequest[T](server: T; rf: RequestFence): InternalRaisesFuture[
    HttpResponseRef, (CancelledError,)] {....stackTrace: false, raises: [], gcsafe,
    raises: [].}