title: requests: how to disable / bypass proxy
body: <p>I am getting an url with:</p>
  
  <pre><code>r = requests.get("http://myserver.com")
  </code></pre>
  
  <p>As I can see in the 'access.log' of "myserver.com", the client's system proxy is used. But I want to disable using proxies at all with <code>requests</code>.</p>