Just one thing to clarify: in Indigo the reverse proxy is provided by a "System Stack nginx" service, so in your setup there will be two Nginx instances. It looks like you've been looking at the logs for the System Stack's nginx; be sure to check the logs for your stack's nginx as well. I plan to eventually provide easier access to the service logs, but for now you'll have to right-click the nginx service in your stack, and choose "Show Compiled in Finder..." from where you can find the relevant logs (and conf) directory.
A few ideas...
Have you checked your PHP logs? Again, right-click your PHP service — you'll find its logs in the Finder there.
It might be worth trying to access your site directly, bypassing the reverse proxy, to confirm the problem is there; do this by appening its port, which you can find in the site configuration. eg for the below config, you'd visit
As you can see, I just installed D9 inside Indigo hoping to replicate the issue you've raised but it installed and ran perfectly; I'm guessing this issue is caused by one or more contrib modules, and the basic Umami Foods demo site is too lightweight. If you think you might know how I could replicate it, I'd be intrigued. However I am hopeful we can get your site up and running without having to replicate the issue myself.
fmitchell If I manually copy the .indigo/stacks/system-stack/nginx_reverse_proxy/conf/sites-enabled/my-site-conf. to the stack location with the nginx_B231 name, it doesn't build and says it cant find the host.
Aha, yes, with the above you'll be overwriting your stack's nginx config with the system stack's reverse-proxy nginx config. The config for your nginx will be at something like
The config suggested in that Stack Overflow solution (ie as per below) is in fact already in the standard Indigo nginx config for a site. Perhaps it's worth trying it outside the
fastcgi_buffers 16 16k;