How to improve SEO with s3-cloudfont & React.js single page application?

I am running backend on node js and front end on aws s3 & react SPA. The fb scrapes only the index.html in s3 always for any route. How can i handle this. My idea is when sharing in facebook i use proxy.example1.com/1/2 and render meta tags here and redirect user to example1.com/1/2