title: 206 Partial Request - Single-range request with overlapping bytes
body: <p>I am implementing a module that supports 206 partial requests.
  After reading RFC rfc2616, i noticed that when receiving a multi-range request, overlapping ranges such as: "a-b, a-d" are not allowed.</p>
  
  <p>My question is:</p>
  
  <p>What happens with single-range request and overlapping bytes? </p>
  
  <pre><code> Request #1:   a-b
   Request #2:   a-d
  </code></pre>
  
  <p>Do I need to ignore bytes a-b in the second request? </p>
  
  <p>OR</p>
  
  <p>Do I need to overwrite the bytes?</p>
  
  <p>Thanks</p>