Is server_name really needed for default_server? (Nginx)

nginx

I tried the 4 cases of code with default_server below one by one in Nginx. The file default.conf with the code is located at /etc/nginx/conf.d/default.conf.

1st: With server_name _;

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;

    return 500;
}

2nd: With a different server name(private ip) server_name 10.0.0.0; (My computer's private ip is 10.156.58.216)

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name 10.0.0.0;
    
    return 500;
}

3rd: With server_name "";

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name "";

    return 500;
}

4th: Without server name

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    return 500;
}

My computer's private ip is 10.156.58.216.

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Then, the results are all the same showing 500 Internal Server Error page.

enter image description here

I think for default server, we don't need server name. So the 4th code without server name is fine to use.

4th: Without server name

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    return 500;
}

I ask again, Is server name really needed for default server?

From the Nginx documentation:

If no server_name is defined in a server block then nginx uses the empty name as the server name.

Regarding server_name _;, the same document states:

There is nothing special about this name, it is just one of a myriad of invalid domain names which never intersect with any real name.

Is server_name really needed for default_server? (Nginx)

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