title: Size of raw response in bytes
body: <p>I need to make a HTTP request and determine the response size in bytes.  I have always used <code>request</code> for simple HTTP requests, but I am wondering if I can achieve this using raw?</p>
  
  <pre><code>&gt;&gt;&gt; r = requests.get('https://github.com/', stream=True)
  &gt;&gt;&gt; r.raw
  </code></pre>
  
  <p>My only problem is I don't understand what raw returns or how I could count this data-type in bytes?   Is using <code>request</code> and raw the right approach?</p>