rewrite *.*.com Host to *.com

[pablo platt]

Hi

I'm using nginx is a proxy for a long polling application.
Old browsers have low limits on number of concurrent http requests so I'm
using arbitrary subdomains for each vhost.

Is it possible to set the Host header to be vhost.example.com when the url
is something.vhost1.example.com
without knowing from advanced what 'something' and 'vhost1' are?

I'm currently able to set Host to *.com but I want to strip the first part.

server {
    listen    80;
    server_name  *.com;

    location /test {
    proxy_set_header  Host $Host;
    proxy_set_header  X-Real-IP  $remote_addr;
    proxy_pass        http://localhost:8000;
    }
}

Thanks
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