message: feat(server): add Builder::http1_keepalive method
diff: @@ -177,6 +177,14 @@ impl<I> Builder<I> {
  }
  }
  + /// Sets whether to use keep-alive for HTTP/1 connections.
  + ///
  + /// Default is `true`.
  + pub fn http1_keepalive(mut self, val: bool) -> Self {
  + self.protocol.keep_alive(val);
  + self
  + }
  +
  /// Sets whether HTTP/1 is required.
  ///
  /// Default is `false`.
  