In NGINX is it possible to return, globally, a 500 response code instead returns 408? It's a strange request, I know. But from the client, that send requests to our Nginx, need to perform a retry if a request fails, and they are able only to intercept 5XX family errors at this time. Change the code is not possible in a quick time
You can set thus:
error_page 408 = @error_target;
location @error_target {
return 500;
}