I have this line in my config file

```
server_name site.com m.site.com

```

My code checks if the url is `m.site.com` and serves the mobile version. However when I do this going to `m.site.com/abc` will show my code `site.com/abc` which is wrong. If I copy/paste the entire block and change site.com to m.site.com it works fine. But I'd rather not have duplicate config (or code).

Is there a way around this?