Hi @marciorpcoelho,
Thanks for your question!  You’re on the right track, it’s just that Streamlit’s execution model won’t really play nice with ExecCGI.
You should run your streamlit app on an unprivileged port (8501 is fine, say), and then use a “reverse proxy” to forward all requests from port 80 (the usual HTTP port) to your streamlit app.
Here’s an example config you can edit for your purposes (and let us know how it goes):
<VirtualHost _default_:80>
DocumentRoot /home/user/website_folder
RewriteEngine On
# Redirect all requests to the local Apache server to port 8080
RewriteRule ^.*$ http://%{HTTP_HOST}:8501%{REQUEST_URI}
</VirtualHost>

ps. we have the beginnings of a FAQ containing such information here 30.  Obviously we have some work to do to improve it!  Thanks for bearing with us.