title: Do canonical links require a full domain?
body: <p>I want to add canonical links to my pages, but do I need to specify the domain, or will a relative URL do?</p>
  
  <p>In other words, is:</p>
  
  <pre><code>&lt;link rel="canonical" href="/item/1"&gt;
  </code></pre>
  
  <p>good enough, or do I need to use:</p>
  
  <pre><code>&lt;link rel="canonical" href="http://mydomain.com/item/1"&gt;
  </code></pre>