upstream foo {
    keepalive 50;
    server 127.0.0.1:5000   max_fails=10 fail_timeout=30s;
}

server {
    listen 80;
    listen [::]:80;
    server_name www.example.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.example.com;

    access_log  /var/log/nginx/example_access.log;
    error_log   /var/log/nginx/example_error.log;

    ssl_certificate     /etc/ssl/cloudflare/example_cert.pem;
    ssl_certificate_key /etc/ssl/cloudflare/example_key.pem;

    include /etc/nginx/ssl.conf;

    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload";

    location / {
        proxy_redirect          off;
        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;
        client_max_body_size    0;
        client_body_buffer_size 128k;
        proxy_connect_timeout   60;
        proxy_send_timeout      60;
        proxy_read_timeout      60;
        proxy_buffers           32 4k;
        proxy_pass http://foo;
    }
}