How to redirect to or from www

Set a canonical domain by redirecting www to non-www (or the reverse) on TurboStack.

Pick one canonical form of your domain - either www.example.com or example.com - and redirect the other to it. This avoids duplicate content and keeps links and analytics consistent.

Before you start

SSH access to the host - see SSH access.
Both forms should point to your server and have a certificate (cert_type: letsencrypt) so HTTPS works after the redirect - see TLS certificates.
Add the rule to ~/nginx/20rewrites.conf - see custom Nginx configuration.

Redirect non-www to www

if ($host ~ ^(?!www\.)(?<domain>.+)$) {
    return 301 $scheme://www.$domain$request_uri;
}

Redirect www to non-www

if ($host ~* ^www\.(?<domain>.+)$) {
    return 301 $scheme://$domain$request_uri;
}

Redirect extra domains to your main domain (keeping the path)

if ($http_host ~* "(old-one\.example\.net|old-two\.example\.org)$") {
    return 301 $scheme://www.example.com$request_uri;
}

Add a trailing slash to a path

Redirect a path without a trailing slash to its slashed form, so a single canonical URL is served:

location /blog {
    rewrite ^/blog$ /blog/ permanent;
}

Redirect a domain to a specific page

Send every request for one domain to a fixed page on another, rather than keeping the requested path:

if ($http_host ~* "^.*your-domain\.be$") {
    rewrite ^/$ https://your-domain/page/ redirect;
}

Apply and verify

tscli nginx reload

Check the redirect (look for 301 and the Location header):

curl -I https://example.com