title: IIS 7 Satisfy Google If-Modified-Since HTTP header Requirement
body: <p>From Google</p>
  
  <blockquote>
    <p>Make sure your web server supports the If-Modified-Since HTTP header.
    This feature allows your web server to tell Google whether your
    content has changed since we last crawled your site. Supporting this
    feature saves you bandwidth and overhead.</p>
  </blockquote>
  
  <p>We run a Umbraco website and am wondering how to satisfy this requirement, I understand that there is issues with the data been "dynamic" and would like to at least say let it expire after 1 day.</p>
  
  <p>This my client and her SEO representative feels is important due to the last Google update.</p>
  
  <p>Thanks in advance guys!!!</p>