location /appstore/ {
    proxy_http_version 1.1;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Real-PORT $remote_port;
    proxy_set_header X-Forwarded-Host $the_host/appstore;
    proxy_set_header X-Forwarded-Proto $the_scheme;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header Scheme $scheme;
    proxy_set_header Server-Protocol $server_protocol;
    proxy_set_header Server-Name $server_name;
    proxy_set_header Server-Addr $server_addr;
    proxy_set_header Server-Port $server_port;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
    proxy_pass http://appstore/;
}