Ping Yu
Ping Yu
I think the issue was introduce in #399 [here](https://github.com/tikv/client-rust/pull/399/files#diff-832170412fc26afb48ddeb047902b49f55afdf899c8efbe35727adb9a4b05351L75) because `hyper` require that the endpoint must have the scheme in URI (otherwise connection will fail and raise the error `hyper::Error(Connect,...
To keep the "historical ttl", I think it would better to add an argument (e.g., `KeepPreviousTtl`) to indicate such request, for backward compatibility.
It seems that if there is still no leader when read through PD server, we would all the same get the no leader error. How about try to handle this...
Let me try to fix it.