Hi there,

As long as you see the Welcome to Nginx page, your domain is pointing to the correct server. Now, we need to make it point to the correct page.

The first thing I noticed is the server_name directive. Do you have special reason why is it set to the Droplet’s IP address?
Try to replace IP with your domain name such as:

...
   server_name example.com
...

Restart Nginx by running the systemctl restart nginx and then give it a try. Maybe, you’ll have to clear browser cache, or to use the incognito mode.

The rule you added later isn’t needed, it should work out-of-box.
For more info how to set up this, I recommend you to look at the How To Set Up Nginx Server Blocks (Virtual Hosts) on Ubuntu 16.04 tutorial.
If nothing helps, you can take a look at the How To Troubleshoot Common Site Issues on a Linux Server tutorial.

I’ve tried that; when it shows

...
 server_name philheijkoop.com;
...

I get a Bad Request (400) error when I go to that URL, and my droplet’s IP then shows the nginx default welcome page.

So the reason it’s set to my droplet’s IP is that’s something I tried that worked.

Did you resolve the problem? I have the same one.

/etc/nginx/sites-available/realtyredefine

server {
    listen 80;
    server_name realtyredefine.com;
    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/vinay/realtyredefine;
    }

    location /media/ {
        root /home/vinay/realtyredefine;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

In my site-available, I put my domain in servername and added my domain in ALLOWEDHOST in setting.py .

Now When I go either to the domain or to IP both shows “Welcome to Nginx”

I know its too late but I recently faced same issue because the documentation is bit confusing. The solution was to add server_name as www.yourdomain.com instead of yourdomain.com and then restart both nginx and gunicorn.

If you want to show a custom page instead of the web app main page, you should map the public ip address of your server to a static page like index.nginx-debian.html
Here is the code to do that

server{
        listen 80;
        server_name $remote_addr;
        location / {
                index index.nginx-debian.html;
                alias /var/www/html/;
        }
}

In this way, all the requests that goes to the 80 port number will automatically redirect to nginx page.
You can also implement an https redirect but that’s almost the same. You only have to create a certificate from a CA or a SelfSigned