ProxyPass for https not working

ProxyPass for https not working

I'm having set of codes in tomcat (port:8080) and another set of codes in
apache (port:80). Now the default port I have set is apache (document
root: /var/www/html) and for tomcat (/usr/.../webapps/ROOT)
Now tomcat codebase is running in https:// www.example.com and apache
codebase is running in http://ww.example.com
I have written proxy as
ProxyPass /req https://example.com/req
ProxyPassreverse /req https://example/req
All the request from http, which contains /req will go to
https://example.com/req.
But the problem is, it is redirected into http://example.com/req
what can I do to redirect to https or what can I do to run tomcat in "http"