Im trying to redirect my Laravel+vuejs+nuxtjs project from http to https but when I enter http://example.com or http://www.example.com an empty file being downloaded instead

What have I done so far :

1- Commenting default_type application/octet-stream and adding default_type text/html instead in nginx.conf

2-defining types { } default_type "text/plain"; in location /{} of the example.com.conf

3-nginx redirect with the code below

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

4- tried to redirect it with a .php file with the following example.com.conf file:

       server {
          listen 37.152.191.249:80;
          server_name www.example.com example.com;

         access_log /usr/local/apache/domlogs/example.com.bytes bytes;
        access_log /usr/local/apache/domlogs/example.com.log combined;
        error_log /usr/local/apache/domlogs/example.com.error.log error;

        root /home/example/public_html/;
        index index.php;

   location / {
types { } default_type "text/plain";
    try_files                       $uri $uri/  /index.php?$query_string;

}

location ~ \.php$ {
   fastcgi_split_path_info         ^(.+\.php)(/.+)$;
    fastcgi_pass                    127.0.0.1:9000;
    fastcgi_index                   index.php;
    include                         fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  fastcgi_intercept_errors        off;
    fastcgi_buffer_size             16k;
    fastcgi_buffers                 4 16k;
    fastcgi_connect_timeout         300;
   fastcgi_send_timeout            300;
    fastcgi_read_timeout            300;
}


        location ~* "/\.(htaccess|htpasswd)$" {deny all;return 404;}

        disable_symlinks if_not_owner from=/home/example/public_html;
}

the index.php in public_html code :

    $location = 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: ' . $location);
    exit;

None of the above worked and the problem still presist.

+Current Configurations :

nginx -t report :

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

example.com.ssl.conf :

server{
  listen xx.xx.xx.xx:443 http2 ssl;
    server_name example.com;
        ssl_certificate      /etc/pki/tls/certs/example.com.bundle;
        ssl_certificate_key  /etc/pki/tls/private/example.com.key;
        ssl_protocols TLSv1.2;
        ssl_ciphers EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EE3CDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA!RC4:EECDH:!RC4:!aNULL:!eN$
        ssl_prefer_server_ciphers   on;

       ssl_session_cache   shared:SSL:10m;
       ssl_session_timeout 60m;
       return 301 https://www.example.com$request_uri;
}
       server {
          listen xx.xx.xx.xx:443 http2 ssl;
          server_name www.example.com;

         access_log /usr/local/apache/domlogs/example.com.bytes bytes;
        access_log /usr/local/apache/domlogs/example.com.log combined;
        error_log /usr/local/apache/domlogs/example.com.error.log error;
        ssl_certificate      /etc/pki/tls/certs/example.com.bundle;
        ssl_certificate_key  /etc/pki/tls/private/example.com.key;
        ssl_protocols TLSv1.2;
        ssl_ciphers EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA!RC4:EECDH:!RC4:!aNULL:!eN$
        ssl_prefer_server_ciphers   on;

        ssl_session_cache   shared:SSL:10m;
        ssl_session_timeout 60m;

        root /home/example/core/public/;
        index index.php;

   location / {
  proxy_set_header                Connection 'upgrade';
    proxy_http_version              1.1;
    proxy_pass                      https://xx.xx.xx.xx:3000$uri;
    proxy_intercept_errors          on;# In order to use error_page directive this needs to be on
    error_page                      404 = @php;
}

location @php {
    try_files                       $uri $uri/  /index.php?$query_string;

}

location ~ \.php$ {
   fastcgi_split_path_info         ^(.+\.php)(/.+)$;
    fastcgi_pass                    127.0.0.1:9000;
    fastcgi_index                   index.php;
    include                         fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
   fastcgi_intercept_errors        off;
    fastcgi_buffer_size             16k;
    fastcgi_buffers                 4 16k;
    fastcgi_connect_timeout         300;
   fastcgi_send_timeout            300;
    fastcgi_read_timeout            300;
}


        location ~* "/\.(htaccess|htpasswd)$" {deny all;return 404;}

        disable_symlinks if_not_owner from=/home/example/public_html;

        location /.well-known/acme-challenge {
                default_type "text/plain";
                alias /usr/local/apache/autossl_tmp/.well-known/acme-challenge;
        }

        location /.well-known/pki-validation {
                default_type "text/plain";
                alias /usr/local/apache/autossl_tmp/.well-known/acme-challenge;
        }
}

Current example.com.conf :

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

I have not added the nginx -T report since it shows irrelevant configuration files from other websites.

Also server running multiple sites and the wordpress ones have no problem redirecting using the code provided at #3 for redirect but when it comes to THE site that uses nuxtjs , I get a empty file downloaded instead.

Any help would be highly appreciated