Simple healthcheck endpoint in nginx server container

I have a docker container running with nginx server.

I want to provide a rest-interface/endpoint to check the health of the server and container. E.g. GET http://container.com/health/ which delivers "true"/OK or "false"/NOK.

What is the simplest and quickist solution or best practice?

P.S. The server serves as a file browser, i.e., with enabled Directory Index Listing.

The following configuration worked for me with nginx version: nginx/1.14.0 (Ubuntu):

    location = /health {
            access_log off;
            add_header 'Content-Type' 'application/json';
            return 200 '{"status":"UP"}';
    }

To test it:

• Install Nginx locally, example on Ubuntu: https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-18-04
• Add location configuration (mentioned above) to the end of server block in the file /etc/nginx/sites-available/default and restart nginx server
• Accessing http://localhost/health should return response {"status":"UP"}