proxy_set_header host

[Fr Tr]

I am having quite some trouble with something that should be pretty
straightforward.

I have an app deployed at http://localhost:9090/app/ , and need to
access it via http://subdomain.domain.com.

Thus I configured the following, which works fine:

        location / {
             proxy_pass              http://localhost:9090/app/;
         }

However now I need to access in my code the "subdomain.domain.com"
variable. I thought passing it through an HTTP header:

        location / {
             proxy_set_header   Host             $host;
             proxy_redirect false;
             proxy_pass              http://localhost:9090/app/;
         }

and I manage to get the header "Host", but its value is
"localhost:9090". Also tried with $proxy_host.

How can I get the value "subdomain.domain.com" in the Host HTTP header?

Thanks,

Francisco
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