You have chosen to open application/octet-stream - wordpress

I have set up nginx on Ubuntu 20.4 and installed PHP 7.4.3.

Here is the content of /etc/nginx/sites-available/default

server {
    listen 80;
    server_name  www.example.com;
    rewrite ^(.*) http://example.com$1 permanent;
}
server {
    listen 80;
    server_name  example.com;
    index index.html index.php;

    root /home/me/wp1/;
    location = /favicon.ico { log_not_found off; access_log off; }
    location = /robots.txt { log_not_found off; access_log off; allow all; }
    location ~* \.(css|gif|ico|jpeg|jpg|js|png)$ {
        expires max;
        log_not_found off;
    }
    location / {
        #try_files $uri $uri/ =404;
        try_files $uri $uri/ /home/me/wp1/index.php$is_args$args;
    }
}

when I type my domain in my firefox browser, I see this downloading page

In addition to that, www did not redirect to the domain without it. I am not sure if this is a separate issue.