title: 404 header - HTTP 1.0 or 1.1?
body: <p>Why does almost every example I can find (including <a href="https://stackoverflow.com/questions/437256/sending-a-404-error-in-php">this question</a> from about a year ago) say that a 404 header should be <code>HTTP/1.0 404 Not Found</code> when we've really been using HTTP 1.1 for over a decade?  Is there any reason not to send <code>HTTP/1.1 404 Not Found</code> instead?</p>
  
  <p>(Not that it matters all that much... I'm mostly just curious.)</p>