DNS check + NGINX conf + Redirect

Hi, I already tried to search a lot but, I admit, I’m stuck. So I would like to check with you what I have and what I want to achieve:

• 1 droplet
• 2 domains (and so 2 websites)

$ORIGIN mydomain1.com. $TTL 1800 mydomain1.com. 1800 IN A xxx.xxx.xx.xxx ( A record @ => xxx.xxx.xx.xxx) test.mydomain1.com. 1800 IN A xxx.xxx.xx.xxx (A record test => xxx.xxx.xx.xxx) www.mydomain1.com. 1800 IN A xxx.xxx.xx.xxx (A record www => xxx.xxx.xx.xxx) NS & Co. records ok …

Question: “www” and “test” should be A records or CNAME records?

Then, server side, with NGINX:

available-site: mydomain1.com

server {
        listen 80;

        root /var/xxxxxx/mydomain1.com/xxx;

        index index.php;

        server_name mydomain1.com www.mydomain1.com;

       ...

It works. Basic stuff right?

I want to redirect www to non-www

Again I searched and I found it is well covered and documented. So I followed and tried:

server {
        listen 80;

        root /var/xxxxxx/mydomain1.com/xxx;

        index index.php;

        server_name mydomain1.com www.mydomain1.com;

        return 301 $scheme://mydomain1.com$request_uri;
       ...

I got the following message:

“Page is not working” “mydomain1.com redirected you too many times ERR_TOO_MANY_REDIRECTS”

2 questions:

server_name mydomain1.com www.mydomain1.com; or server_name www.mydomain1.com mydomain1.com; or server_name www.mydomain1.com;

And why I got this error.

When I play around even if I get the error if I do “curl -I http://www.mydomain1.com” I got the following output:

HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Sun, 17 Apr 2016 08:52:47 GMT
Content-Type: text/html
Content-Length: 178
Connection: keep-alive
Location: http://mydomain1.com/

But as soon as I hit the browser I receive the error…

Can you please help me to solve this. Thank you.