Following the indications here: https://docs.nginx.com/nginx/admin-guide/web-server/serving-static-content/
I modified the lines in /etc/nginx/conf.d/default.conf as follows:

server {
root /home/marco/webMatters/vueMatters/GraspGlobalChances/src/components/auth/weights;

location / {
try_files $uri /weights/ssd_mobilenetv1_model-shard1;
}
}

I also tried to add these two options:

server {
root /home/marco/webMatters/vueMatters/GraspGlobalChances/src/components/auth/weights;

location / {
sendfile on;
tcp_nopush on;
try_files $uri /weights/ssd_mobilenetv1_model-shard1;
}
}

But still got the problem

Marco