How to put Strapi into a folder

System Information
  • Strapi Version: 3.6.8
  • Operating System: centos
  • Database: mysql
  • Node Version: 14.8.0
  • NPM Version: 6.14.8
  • Yarn Version: 1.21.1

I want to serve my strapi inside a folder, eg.

I tried in NGINX to serve whole site under
but the internal api from strapi will still lead to, but not
is there any plublic_url param I can set?

Thx very much