One canonical URLOne canonical URL

Six addresses, one page

Press Crawl and watch where the 90 links land.

// app/layout.tsx
export const metadata = { metadataBase: new URL("https://www.example.com") };

// app/shoes/page.tsx
export const metadata = { alternates: { canonical: "/shoes" } };

Every signal names one URL

Change any signal, or make them all agree.

// next.config.ts
export default {
  trailingSlash: false,
  async redirects() {
    return [{
      source: "/:path*",
      has: [{ type: "host", value: "example.com" }],
      destination: "https://www.example.com/:path*",
      permanent: true,
    }];
  },
};

Filters mint URLs

Click filters in any order and count the indexed URLs.

Why it matters, pros and cons