I am hosting a site on port 80 on my Ubuntu Apache2 server.
I am using another VirtualHost with ServerName set to app.mydomain.com for a certain area of my site. That VirtualHost uses DocumentRoot.
I have another Apache VirtualHost port 80 site enabled which has a reverse proxy to 192.168.1.200:8080 (which is the address that code-server is listening on). This is the contents of my dev.mydomain.com site:

<VirtualHost *:80>
 RewriteEngine On
 ServerName dev.[mydomain].com
 # Proxy Traffic
 RewriteCond %{HTTP:Upgrade} =websocket
 RewriteRule /(.*) ws://192.168.1.200:8080/1ドル [P,L]
 RewriteCond %{HTTP:Upgrade} !=websocket
 RewriteRule /(.*) http://192.168.1.200:8080/1ドル [P,L]
</VirtualHost>

When I go to dev.mydomain.com, I see code-server login page. However, when I log in, the page hangs. Also, if I go to an invalid address (such as dev.mydomain.com/non-existant-page), I see a code-server 404 error page.

If I go to mydomain.com:8080, the site works fine.

code-server service start command: /usr/lib/code-server/lib/node /usr/lib/code-server --bind-addr 192.168.1.200:8080 --user-data-dir /var/lib/code-server --auth password

Could anyone please help? I'm not sure if the problem is with my Apache config or with code-server config.