Note to self:

When I run into the issue where Vite HRM is not working in Laravel and 404 responses for requests to __vite_ping start showing up in the browser, read this issue.

Add

server: {
      https: true,
      hmr: {
        host: 'localhost',
      }
    }

to your Vite config.

You have no idea how many times I keep running into this and forgetting how to fix it.