How to handle a subdomain isomorphically with the reaction + router + redux?

Question

I am creating a service where other companies can host a community at companyname.mydomain.com . I have a Redux reducer called company , which contains a certain state about this company. I would like to be able to get data about this company isomorphically based on the requested subdomain.

If I have a getSubdomain function:

 function getSubdomain(host) { const hostWithoutPort = host.split(':')[0]; return hostWithoutPort.split('.').slice(0, -2).join('.'); } 

Then on the client I got a subdomain by doing:

 const subdomain = getSubdomain(window.location.host); 

On the server, since the window is not available, and the host is different for each request, I would do:

 const subdomain = getSubdomain(request.headers.host); 

What is the right strategy to correctly extract company data based on this subdomain? I think maybe I could initialize my store using a subdomain set to state?