Using a desktop web browser…
It doesn’t seem like a timeout, it is always fast to respond with the error and also fast on successful loading pages. It seems to me there is some kind of resource/parameter starvation in nginx or the nginx bridges to the NodeJS app…
I’m also seeing problems with static content loading, images and css files not loading and getting a mangled half-generated page or missing icons for upvote/downvote that I have to refresh the browser with. This happens at least 1 in 8 refreshes of the page.
In the most recent hour, it has gotten better. I’d say 500 errors from nginx are only coming up more like 1 in 25 web page refreshes.