How to point wildcard subdomain to some /subfolder or /path?

Questions / Help
1

I have an app where users can create unique usernames like domain.tld/username but I also want them to use the username as username.domain.tld and point it to domain.tld/username.

Is it possible with fly.io? I search everywhere but couldn’t find a way.

2

You can add wildcard domains on fly.io, see e.g. Limitations with respect to wildcard certs or domains per app? - #7 by Zane_Milakovic

Then, handle forward on within your application (or probably on some reverse proxy which you are using inside your image, like nginx).

as an example,

server {
    listen 80;
    server_name ~^(?<subdomain>.+)\.example\.com$;

    location / {
        rewrite ^ https://example.com/$subdomain permanent;
    }
}
1 Like
3

Thank you for your reply.

I am using Nextjs and deployed using fly deploy I know it uses docker but I have not installed any server application like nginx or caddy.

Is there any work around with just nextjs or do I need to figure how to install nginx for the nextjs app?

4

You can probably do something like this within your next.config.js (not sure it works, but try out, see documentation at next.config.js Options: redirects | Next.js)

module.exports = {
  async redirects() {
    return [
      {
        source: '/:path*',
        destination: '/:path*', 
        permanent: true,
        has: [
          {
            type: 'host',
            value: '(?<subdomain>.+)\\.example\\.com',
          },
        ],
      },
    ]
  },
}
5

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