How to implement domain name redirection similar to Bing?

For example, when we visit Bing in China, Bing will jump to cn.bing.com
Excuse me: How to achieve a second-level domain name jump similar to Bing?

Reply content:

For example, when we visit Bing in China, Bing will jump to cn.bing.com
Excuse me: How to achieve a second-level domain name jump similar to Bing?

There are many practical solutions~ I will introduce two common ones to you:

1. DNS resolution solution, many advanced DNS resolutions can be resolved by region (such as DNSPOD), just change the resolution of the corresponding region into a jump.
   The advantage is that it is very fast, but the disadvantage is that it is inflexible

2. Program judgment, use IP to judge the source, and then jump in PHP. It is very easy to judge the source by IP. Many third-party IP interfaces can give the ownership of the IP.
   The advantage is that it is very flexible, but the disadvantage is that each request has to go to the PHP processing area, and performance needs to be considered.

3. Server judgment is actually the same as above. Nginx uses a script to judge the IP ownership and then jumps.
   The advantage is that it is fast, but the disadvantage is that maintenance is a little troublesome

Use GeoIP or ready-made IP API library.
Both nginx and php have extensions.