Service discovery at Stripe(stri.pe)

    http {
        proxy_next_upstream error timeout http_502 http_504;

        match statusok {
            status 200;
            body ~ "200 OK";
        }

        upstream backend {
            state /etc/nginx/backend-state/backends;
            zone backend 256k;
            keepalive 20;
        }
    }

    server {
        # dynamic upstream
        location = /upstream_conf {
            upstream_conf;
            allow 127.0.0.1;
            deny all;
        }

        location / {
            proxy_connect_timeout 15s;
            proxy_http_version 1.1;
            proxy_set_header Connection "";
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;

            proxy_pass http://backend;
        }

        # health check
        location /internal-health-check {
            internal;

            proxy_connect_timeout 15s;
            proxy_http_version 1.1;
            proxy_set_header Connection "";
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;

            proxy_pass http://backend;
            health_check interval=3s fails=3 passes=5 uri=/health match=statusok;
        }
    }