title: how to scrapy handle dns lookup failed
body: <p>I am looking to handle a DNS error when scraping domains Scrapy.</p>
  
  <p><strong>Here's the error that I am seeing:</strong></p>
  
  <pre><code>ERROR: Error downloading &lt;GET http://domain.com&gt;: DNS lookup failed: address 'domain.com' not found [Errno 8] nodename nor servname provided, or not known.
  </code></pre>
  
  <p>How could I be notified when I get an error like this, so that I can handle it myself without Scrapy just throwing an error and moving on.</p>