0curl: (6) Could not resolve host: mydomain.com after Redirect non-www to www with Nginx

I’ve followed a tutorial post about redirect on Digital Ocean’s community.

But things didn’t worked for me as in the tutorial.

Below is my server block code for redirect from config file /etc/nginx/conf.d/redirect.conf :

server {
    server_name www.crusadehimalaya.com;
    return 301 $scheme://crusadehimalaya.com$request_uri;
}

I’ve also added A record with **“www” ** and @

Running ```curl -I http://www.crusadehimalaya.com

% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 194 0 0 0 0 0 0 --:–:-- --:–:-- --:–:-- 0 HTTP/1.1 301 Moved Permanently Server: nginx/1.14.0 (Ubuntu) Date: Tue, 04 Dec 2018 07:45:15 GMT Content-Type: text/html Content-Length: 194 Connection: keep-alive Location: http://crusadehimalaya.com/

Running ```curl -I http://crusadehimalaya.com```
Gives following output:

% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:–:-- --:–:-- --:–:-- 0curl: (6) Could not resolve host: crusadehimalaya.com