title: How is an HTTP multipart "Content-length" header value calculated?
body: <p>I've read conflicting and somewhat ambiguous replies to the question "How is a multipart HTTP request content length calculated?".  Specifically I wonder:</p>
  
  <ul>
  <li>What is the precise content range for which the "Content-length" header is calculated?</li>
  <li>Are CRLF ("\r\n") octet sequences counted as one or two octets?</li>
  </ul>
  
  <p>Can someone provide a clear example to answer these questions?</p>