How to make a subdomain with the main page on one of the pages of the site?

Question

Nginx

Good afternoon! Subject:
There is a site on Yii and the nginx web server, I want to make a subdomain, the mainpage of which will be one of the pages of this subdomain,
i.e. there is mysite.com
there is a page mysite.com/page1
when sub.mysite.com was entered, mysite.com/page1 opened, while the user had sub.mysite.com in the browser, with the ability to navigate the entire site in the future.

Answer 1

This is called proxying and can be done by setting proxy_pass in nginx.
https://nginx.org/ru/docs/http/ngx_http_proxy_modu...