nodejs + nginx getting 502 error when using https module instead of http

I have make my nodejs app, hosted it on digital ocean server connect it to domain name, and all works fine, but when i'm trying to put ssl certificate (using https module instead of http), it doesn't works. Here is a code:

var sslopt = {

    key  : fs.readFileSync('./ssl/server.key'),
    cert : fs.readFileSync('./ssl/server.crt'),
    ca   : [fs.readFileSync('./ssl/ca1.crt'), fs.readFileSync('./ssl/ca2.crt')]

};

var server = https.createServer(sslopt,function(req,res){
    ...
});

server.listen(8001,function(err){
    ...
});

My nodejs app running fine but if i'm trying to access it, I just see the 502 Bad Gateway error, and no requests was sent to my nodejs app. When I have opened my nginx error log I see the errors

-date- -time- [error] 18116#18116: *1 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: -ip-, server: -server-, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8001/", host: -host-

But the most strange thing that if I'm trying to get access with https protocol and port 8001 (https://{domainname}.com:8001) I can see my app working fine, but connection is not secured.

I just can't understand what I'm doing wrong...

P.S.

my nginx config file

server {
    listen *:443;
listen *:80;


    server_name {myhostname};

    access_log /var/log/nginx/qt.access.log;
    error_log /var/log/nginx/qt.error.log;

    root /srv/qt;
    index index.html index.htm index.php;


    # Headers to pass to proxy server.
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;
    proxy_set_header X-NginX-Proxy true;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_cache_bypass $http_upgrade;
    proxy_http_version 1.1;
    proxy_redirect off;
    # Go to next upstream after if server down.
    proxy_next_upstream error timeout http_500 http_502 http_503 http_504;
    proxy_connect_timeout 5s;
    # Gateway timeout.
    proxy_read_timeout 20s;
    proxy_send_timeout 20s;
    # Buffer settings.
    proxy_buffers 8 32k;
    proxy_buffer_size 64k;




    location  / {



        proxy_pass http://127.0.0.1:8001;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    }

}

via Ілля Мороз