which one is right about RedirAddr and ServerName?

[qwerttvv]

or
which one is better about RedirAddr and ServerName?

A
ServerName: princeton.edu
RedirAddr: 140.180.223.22

B
ServerName: www.princeton.edu
RedirAddr: 140.180.223.42

C
ServerName: www.princeton.edu
RedirAddr: www.princeton.edu

D
ServerName: princeton.edu
RedirAddr: princeton.edu

actually, princeton.edu redirect to www.princeton.edu

so, A B C D, which one is right or better?

[malikshi]

redirAddr for serverside you can use IP/hostname.
ServerName for clientside using hostname only
see example: https://github.com/cbeuw/Cloak/tree/master/example_config

[qwerttvv]

redirAddr for serverside you can use IP/hostname.
ServerName for clientside using hostname only
see example: https://github.com/cbeuw/Cloak/tree/master/example_config

www.bing.com 204.79.197.200????

In china, i dont think the example is a good idea……

[malikshi]

You can use any hostname as long as work in you country, I just mention example only.
Usually I'm using IP of my own isp that have collaboration with hostname like line/fb/etc for serversidw and use ServerName of fb/line in client side

[Klaaktu]

bing.com goes to 13.107.21.200 / 204.79.197.200, which are non-cn IPs. And then they redirect to www.bing.com, or cn.bing.com if accessed by Chinese IP. 13.107.21.200 / 204.79.197.200 & 202.89.233.100 / 202.89.233.101 seem to be MS CDNs (they all serve both versions, but access from Chinese IPs are redirected to cn.bing.com). Which IP u get depend on DNS response.
For example, my ISP DNS says bing.com goes to 204.79.197.200 / 13.107.21.200(non-cn IP), then www.bing.com & cn.bing.com to 202.89.233.100 / 202.89.233.101(cn IP). However international DNS servers just give 204.79.197.200 for cn.bing.com as well. I guess MS got the IPs/domain whitelisted by GFW to avoid problems.
EDIT: See the certificate for the DNS names the IP has.

[malikshi]

Yes. You can choose one of them that got white listed gfw. I think they didn't change that often so it's would be fine. I prefer using IPs than using hostname(I think latest update support redir on IPs and hostname) on side server

[qwerttvv]

now, i use
ServerName: www.princeton.edu
RedirAddr: www.princeton.edu

i think princeton cant be block by gfw....its a university......

[Klaaktu]

Fail to resolve RedirAddr causes ck-server to fail

ck-server-linux-amd64[666]: time="2021-04-08T13:02:11Z" level=fatal msg="unable to initialise server state: unable to parse RedirAddr: unable to resolve RedirAddr: lookup www.bing.com on 127.0.0.1:53: read udp 127.0.0.1:56266->127.0.0.1:53: i/o timeout. "