title: Some Google CDN resources have short expiry dates
body: <p>I was analysing my page with Google PageSpeed, but was suprised to find that it was Google itself bringing errors:</p>
  <h1>Suggestions for this page</h1>
  <p>The following cacheable resources have a short freshness lifetime. Specify an expiry of at least one week in the future for the following resources:</p>
  <ul>
  <li><a href="https://apis.google.com/js/plusone.js" rel="nofollow noreferrer">https://apis.google.com/js/plusone.js</a> (30 minutes)</li>
  <li><a href="http://www.google-analytics.com/ga.js" rel="nofollow noreferrer">http://www.google-analytics.com/ga.js</a> (12 hours)</li>
  </ul>
  <p>It seems Google's CDN files for +1 and Analytics have super-short expiry times, defeating the purpose of a CDN.</p>
  <p>Why is this the case?</p>