How do I do a permanent 301 redirect asynchronously after fetching data from the api

My site is a rebuild and I need to put permanent '301' redirects in place after fetching some data.

EG. user requests `/oldurl/old-reference`.

This is routed to a component for handling it. I use asyncConnect to make a call to the API through redux. When this returns I need to make a 301 redirect to the new url: `newurl/new-reference-from-api`. How do I communicate this back up to `server.js` after redux receives the data?

All this needs to happen in the initial server side rendering. The old urls are only accessed from external locations such as search engines.