The php page was maintained with the existing domain, and the new page was created in node.js.

The frontend of the Node.js project used the 'react.js' CRA.

Node.js was using Apache reverse proxy, but only empty index.html is delivered because static/js were not received client.

I was used express server. And setup express.use static and sendfile

<VirtualHost *:80>
ServerAdmin ...
DocumentRoot [phpProjectRoot]
ServerName ...
ErrorLog ...
CustomLog ... common

ProxyRequests Off
ProxyPreserveHost On
<Location /node>
ProxyPass http://127.0.0.1:5000/
ProxypassReverse http://127.0.0.1:5000/
</Location>
</VirtualHost>

If the project is linked to a new domain, the web page works properly. However, I need to connect to existing domains and projects.