Rewrite subdomains in Nginx

Question

Because I don't want to use CDN anymore I would like to rewrite cdn.example.com to www.example.com. How to do this with Nginx? There is only www.example.com in my server block.

Answer 1

server {
    server_name cdn.example.com;
    return 301 $scheme://www.example.com$request_uri;
}

This assumes two things:

• That cdn.example.com DNS is pointed at the same place www.example.com
• That content served from CDN is being hosted on www under the same paths