Nginx how to make a redirect condition based on response status and url pattern?

Question

Nginx

SEO specialists set the task: If the url does not contain a slash at the end, then perform a redirect only if the response is 200, otherwise immediately issue a 404. It turns out that you need to either solve the issue at the php application level, or intercept nginx response status and perform a redirect only if there is no slash at the end and the response code is 200. How can it be implemented at the nginx level?

Answer 1

Just think: if the server response is successful 200 (document found), then do a 302 redirect, and if, for example, the response is 202 (which is also a successful response), then respond with a 404 error. It smacks of nonsense, agree.
Either you misunderstood the task, or the SEOs suggest doing something stupid.