title: What are the numbers after the HTTP status codes in App Engine's dev_appserver.py logs?
body: <p>When I run <code>dev_appserver.py</code> locally I see messages like this:</p>
  
  <pre><code>INFO     2014-01-05 02:19 ... default: "GET / HTTP/1.1" 200 793
  INFO     2014-01-05 02:19 ... default: "GET /static/css/style.css HTTP/1.1" 200 1253
  INFO     2014-01-05 02:20 ... default: "GET / HTTP/1.1" 200 801
  ...
  </code></pre>
  
  <p>What do the numbers at the end of the lines represent?  In this case 793, 1253, 801?</p>