Question

'www.domainname.com' not working but 'domainname.com' works

I have added CNAME like this:

hostname: www ip: @

but still when i try to access www.domainname.com, it gives Bad Request (400) error. I am using nginx and gunicorn for django application.

Whats going on? can anybody find a solution?

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Looks like your nginx config file like this?

server {
    listen       80;
    server_name  example.org;
    return       301 http://www.example.org$request_uri;
}

server {
    listen       80;
    server_name  www.example.org;
    ...
}

Setting the error_log /var/log/nginx/error.log debug; and show us what the log…