Nginx configuration reverse proxy, the page to take the absolute URL address problem display proxy port

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Upstream Tomcat {
Server 127.0.0.1:82;
}

Location/{
Proxy_pass Http://tomcat;
}

As configured above, the reverse proxy is accessed using http://test.xxx.com/, but the link in the page becomes:
Http://tomcat:82/xxxx.html

I would like to ask you, this how to configure, in order to make the page inside the link address is http://test.xxx.com/xxxx.html

Workaround:

Location/{

Proxy_pass Http://tomcat;
Proxy_set_header HOST $host;
Proxy_set_header X-real-ip $remote _addr;
Proxy_set_header x-forwarded-for $proxy _add_x_forwarded_for;

}

Nginx configuration reverse proxy, the page to take the absolute URL address problem display proxy port