Ivan Ustûžanin

-            proxy_pass http://localhost:5001;
+            proxy_pass http://localhost:5001/;

set $origin домен-оригинала-сайта;
location / {
  proxy_http_version 1.1;
  proxy_set_header Connection '';

  proxy_set_header Accept-Encoding '';

  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;

  proxy_pass https://куда-коннектиться;
  proxy_ssl_name $origin;
  proxy_set_header Host $origin;

  proxy_cookie_domain $origin $http_host;
  proxy_redirect http://$origin/ https://$http_host/;
  proxy_redirect https://$origin/ https://$http_host/;

  sub_filter //www.$origin/ //$http_host/;
  sub_filter //$origin/ //$http_host/;
  sub_filter_once off;
  sub_filter_types text/css application/javascript application/x-javascript image/svg+xml;
}

location /backup/ {
  proxy_pass https://192.168.100.8:8007/;
  proxy_redirect https://192.168.100.8:8007/ /backup/;
}