Nginx rewrite non-www-prefixed domain to www-prefixed domain

Question

I see the Nginx HttpRewriteModule documentation has an example to rewrite a www-prefixed domain to a non-www-prefixed domain:

if ($host ~* www\\.(.*)) {
  set $h         


        

Answer 1

Solution for multiple domains, working on nginx 1.17 for me:

server {
        listen                                80;
        server_name                           .example.com;

        set $host_with_www                 $host;

        if ($host !~* www\.(.*)) {
            set $host_with_www www.$host;
        }

        return                                301 https://$host_with_www$request_uri;
}

In this config example additionally rewrites HTTP on HTTPS, if you don't want rewrite — replace https:// with http:// in return string.

If you want keep protocol — use $scheme variable.