title: HTTP response headers: multiple Link values
body: <p>I'm working on SEO for a Rails App.</p>
  <p>The website is fully localized, and I'm following <a href="https://support.google.com/webmasters/answer/189077?hl=en" rel="nofollow noreferrer">this google article</a> to add <strong>hreflang alternate</strong> links to the pages.</p>
  <p>The HTML links in the <code>&lt;head&gt;</code> are ok.</p>
  <p>I'm having some troubles with the <a href="https://www.rfc-editor.org/rfc/rfc5988#section-5" rel="nofollow noreferrer">response headers</a>.</p>
  <p>I understand that I'm supposed to provide values for each alternative version of the page, but I'm not sure about how to set multiple values.</p>
  <p>I tried to pass them as a <em>comma separated list</em>. Browsers seem to receive it correctly, but since individual values contain semi-colons it looks <em>wrong</em>.</p>
  <p>Is there any reference on it?
  Even an example webpage that is known to implement it correctly would help.</p>