Canonical URLs

<link rel="canonical" href="https://mysite.com/page-a" />

export const metadata = {
  metadataBase: new URL('https://site.com'),
  alternates: {
    canonical: '/',
  },
}

<Helmet>
  <link rel="canonical" href={window.location.href} />
</Helmet>

useHead({
  link: [ { rel: 'canonical', href: 'https://site.com' + route.path } ]
})

<script>
  import { page } from '$app/stores';
</script>
<svelte:head>
  <link rel="canonical" href={$page.url.href} />
</svelte:head>

<link rel="canonical" href={Astro.url} />

<link rel="canonical" href="{{ url()->current() }}" />

<link rel="canonical" href="<%= request.original_url %>" />

<link rel="canonical" href="{{ request.build_absolute_uri }}" />

<link rel="canonical" href="{{ request.url }}" />

<link rel="canonical" href="@Context.Request.GetDisplayUrl()" />

<link rel="canonical" href="{{ .Canonical }}" />

<link rel="canonical" th:href="${#httpServletRequest.requestURL}" />