-我利用namecheap申請一個domain name並且為它申請ssl認證
-然後我的網頁是在digital ocean的虛擬主機所架起來的
-在如果是在http連接的話會自動redirect到https的port

app.all('*',(req,res,next) =>{
    if(req.secure){
        console.log("secure!");
        return next();
    }
    else{
        res.redirect(307,'https://' + req.hostname + ':'+ app.get('secPort') + req.url);
    }
});

-之後再利用Nginx反向代理連結到我的domain name
-但是Nginx一直沒辦法成功找到我的domain name
-而且每次打domain name都會變成my_ip:port
/etc/nginx/sites-enabled/default

 server_name jiangdai.me;

    location / {
        proxy_pass http://my_ip:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        #try_files $uri $uri/ =404;
    }