Apache

websocket.conf

<IfModule mod_ssl.c>
<VirtualHost *:443>
        ServerName myserver.com

        ProxyPreserveHost On
        ProxyRequests Off

        RewriteEngine On
        RewriteCond %{HTTP:Upgrade} =websocket [NC]
        RewriteRule /(.*)           ws://localhost:8000/$1 [P,L]
        RewriteCond %{HTTP:Upgrade} !=websocket [NC]
        RewriteRule /(.*)           http://localhost:8000/$1 [P,L]
        ProxyPassReverse / http://localhost:8000/

        SSLCertificateFile /etc/letsencrypt/live/myserver.com/cert.pem
        SSLCertificateKeyFile /etc/letsencrypt/live/myserver.com/privkey.pem
        Include /etc/letsencrypt/options-ssl-apache.conf
        SSLCertificateChainFile /etc/letsencrypt/live/myserver.com/chain.pem
</VirtualHost>
</IfModule>