[vinuabe4]

I have installed calibre web server on ubuntu server and I used nginx reverse proxy to enable SSL. Please find my below mentioned calibre nginx config.

server {
listen 80;
server_name ebooks.everly.to;


location / {
               proxy_buffering off;
               proxy_pass http://78.46.187.23:8080$request_uri;
return         301 https://$server_name$request_uri;
        }
}

server {
listen 443;
server_name ebooks.everly.to;
ssl on;
        ssl_certificate /opt/certificate.crt;
        ssl_certificate_key /opt/private.key;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers HIGH:!aNULL:!MD5;
        access_log /var/log/calibre-server-access.log;
        error_log /var/log/calibre-server-error.log info;
        proxy_set_header X-Forwarded-For $remote_addr;


location /calibre/web/ {

proxy_set_header        Host                $http_host;
    # The line below is the key line you need:
    proxy_set_header        X-Scheme            $scheme;
    proxy_set_header        X-Real-IP           $remote_addr;
    proxy_set_header        X-Forwarded-For     $proxy_add_x_forwarded_for;
    proxy_set_header        X-Forwarded-Proto   $scheme;
    proxy_intercept_errors  on;
    proxy_http_version      1.1;


    proxy_pass              http://78.46.187.23:8080;
}
}

but when I using "return 301 https://$server_name$request_uri;" to forward http traffic to https I am getting "Failed to communicate with "/interface-data/init?1579406936518", network error. Is the server running and accessible?" error

please help me with this