At least the Ubuntu nginx package installs /etc/nginx/proxy_params, which contains the idiomatic proxy forwarding header config like the one below, so we don’t have to write them manually!

proxy_set_header Host $http_host;
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;

This proxy_params can be inserted by writing just one derective include proxy_params;. So the minimal proxy config for nginx would be something like this:

server {
	listen 80;
	listen [::]:80;

	server_name example.com;

	location / {
		 proxy_pass http://localhost:3000;
		 include proxy_params;
	}
}

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