You only need to proxy all route to index.html, exclude the markdown file. Such as nginx

server {
    listen 80;
    server_name xxx.com;

    location ~ \.md$ {
        break;
    }

    location / {
        rewrite / /index.html;
        break;
    }
}

Thanks for your instructions! It helped a lot.

It works well for the pages in /docs/, but not for those in /docs/zh-cn/.
When /zh-cn is visited, docsify will try to use '/zh-cn.md'...

Adding one more location match can fix it:

location = /zh-cn {
	rewrite / /zh-cn/ permanent;
}

But this way a '/' will be appended to the url.
i.e. when I visit https://docs.snipaste.com/zh-cn, the url will be changed to https://docs.snipaste.com/zh-cn/.
Though it's no big deal, is there any way to fix this?

It is right. You need visited '/zh-cn/'.

OK. Thanks!