Install command for docker after reverse proxy?

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Hello,
thanks for the information!

Now I have get the minimal.conf file:

#Use this example for proxy traffic to the document server running at 'backendserver-address'.

upstream docservice {
  server backendserver-address;
}

map $http_host $this_host {
    "" $host;
    default $http_host;
}

map $http_x_forwarded_proto $the_scheme {
     default $http_x_forwarded_proto;
     "" $scheme;
}

map $http_x_forwarded_host $the_host {
    default $http_x_forwarded_host;
    "" $this_host;
}

map $http_upgrade $proxy_connection {
  default upgrade;
  "" close;
}

proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $proxy_connection;
proxy_set_header X-Forwarded-Host $the_host;
proxy_set_header X-Forwarded-Proto $the_scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;


server {
  listen 0.0.0.0:80;
  listen [::]:80 default_server;
  server_tokens off;

  location / {
    proxy_pass http://docservice;
    proxy_http_version 1.1;
  }
}

My docker ps command show this content:

CONTAINER ID   IMAGE                       COMMAND                  CREATED      STATUS      PORTS                                            NAMES
6e52372f4596   onlyoffice/documentserver   "/app/ds/run-documen…"   2 days ago   Up 2 days   443/tcp, 0.0.0.0:5000->80/tcp, :::5000->80/tcp   romantic_mirzakhani

What parameter must I change in the minimal.conf file?
Thank you!