Here is my conf file for Swag. Hope it helps:
## Version 2021/05/21
# Ensure your DNS has a CNAME set for searxng and that searxng container is not using a base URL.
server {
listen 443 ssl;
listen [::]:443 ssl;
server_name my_subdomain.*;
include /config/nginx/ssl.conf;
client_max_body_size 0;
location / {
include /config/nginx/proxy.conf;
include /config/nginx/resolver.conf;
set $upstream_app searxng;
set $upstream_port 8080;
set $upstream_proto http;
proxy_pass $upstream_proto://$upstream_app:$upstream_port;
}
}