title: urllib3 connectionpool - Connection pool is full, discarding connection
body: <p>Does seeing the </p>
  
  <pre><code>urllib3.connectionpool WARNING - Connection pool is full, discarding connection
  </code></pre>
  
  <p>mean that I am effectively loosing data (because of lost connection)<br>
  OR <br>
  Does it mean that connection is dropped (because pool is full); however, the same connection will be re-tried later on when connection pool becomes available?</p>