301 Redirects for Domain Migration SEO

The problem with domain migrations

When you move from old-brand.com to new-brand.com, every URL on the old domain still has backlinks, bookmarks, and ranking authority built up over years. If those URLs suddenly return 404s, that authority evaporates.

A 301 permanent redirect signals to search engines: "this content has permanently moved — transfer all ranking signals to the new URL." Google has confirmed that 301 redirects pass the vast majority of PageRank. But only if they are implemented across every single URL, not just the homepage.

Most domain migration failures happen because teams get the homepage redirect right but miss hundreds of blog posts, product pages, and category URLs. Managing this in server config means hundreds of lines of Nginx rewrite rules or .htaccess entries — easy to mis-configure, hard to audit, and requiring server access to change.

The traditional approach: server config

A typical Nginx config for a domain migration quickly becomes unmanageable:

# nginx.conf — 200 lines and growing
server {
  listen 80;
  server_name old-brand.com;

  rewrite ^/blog/post-one$ https://new-brand.com/blog/post-one permanent;
  rewrite ^/blog/post-two$ https://new-brand.com/blog/post-two permanent;
  rewrite ^/products/widget-a$ https://new-brand.com/products/widget-a permanent;
  # ... 200 more lines ...
  rewrite ^/(.*)$ https://new-brand.com/$1 permanent;
}

Every change requires an SSH session, a config edit, an Nginx reload, and a careful review to avoid breaking other rules. One typo in a regex can redirect the wrong URLs or cause infinite loops. And there is no audit trail of who changed what.