salix/front/nginx.conf

upstream back {
	server back_1:3000;
	server back_2:3000;
	server back_3:3000;
}
server {
	listen        80 default_server;
	listen        [::]:80 default_server;
	server_name   _;
	autoindex     off;

	root /salix/dist;
	error_page 404 = @notfound;

	location @notfound {
		return 302 /;
	}
	location ~ ^(/[a-zA-Z0-9_-]+)?/(?<path>api(/.*)?)$ {
		proxy_pass http://back/$path$is_args$args;
	}
	location / {
		autoindex on;
	}
}