How in Nginx before proxy_pass to check the availability of the person to whom we are forwarding?

Question

Nginx

When the host being redirected to via Nginx is unavailable, the browser has to wait 7-10 seconds before showing the visitor a timeout.
How to make Nginx tell the browser service unavailable immediately if the host being redirected to is down?

Answer 1

So redirect or proxy_pass?

spoiler

люблю задавать этот вопрос на собеседованиях

proxy_connect_timeout can be set