• http://www.22by4.com/ Sundeep Reddy

    Hey Barry,
    Is If-Modified-Since important to have for other websites? I don’t see anyone using it.

  • Alec Bertram

    The regular googlebot utilises if-modified-since pretty heavily. Enabling it on your site speeds up crawling as googlebot does not need to download the page again (including grabbing any JS/CSS/img resources) or processing to determine whether the page has actually changed.