Nginx proxy pass - not working properly

I am trying to get some more simplicity in accessing my services without using ports. Sickbeard plugin has this great function of setting proxy pass automatically by one click, so now I can access it through http://myserver.local/sickbeard, the code in /etc/nginx/openmediavault-webgui.d/sb.conf shows:

##Generated by the openmediavault-sickbeard plugin.




location /sickbeard {
        proxy_pass        http://localhost:8081/sickbeard;
        proxy_set_header  Host localhost:8081;
        proxy_redirect    default;
}

I tried to adapt it for Radarr as follows:

location /radarr {
        proxy_pass        http://localhost:7878;
proxy_set_header  Host localhost:7878;
        proxy_redirect    default;
}

The thing I received going into http://myserver.local/radarr is a plain text website saying "Radarr Ver." What can be the issue?