I am wondering if the following is possible. We serve a multi-tenant site that selects the correct tenant based on the host subdomain name (e.g.
c1.example.com might be customer1 and
c2.example.com might be customer2).
We were hoping to use DNS to enable us to serve
c1.example.com from, e.g.
www.customer1.com and c2.example.com from
www.customer2.com to support vanity domains. We have setup the CNAMES in DNS correctly, but there doesn’t seem to be a way to get the host name of the origin server when the cloudflare proxy retrieves from the origin. When a user visits
www.customer1.com (which has a CNAME that points to
c1.example.com), we would like the origin site hosted at
c1.example.com to know what origin host name origin was mapped in DNS (i.e. we would like to be able to get the value
c1.example.com when someone visits
Is this scenario possible or supported or is there perhaps something obvious that I’m missing?
Is there a header or some other way we can get hold of the mapped origin host name from the origin server?