title: Change the connection pool size for Python's "requests" module when in Threading
body: <p>(edit:  Perhaps I am wrong in what this error means.  Is this indicating that the connection pool at my CLIENT is full?  or a connection pool at the SERVER is full and this is the error my client is being given?)</p>
  
  <p>I am attempting to make a large number of <code>http</code> requests concurrently using the python <code>threading</code> and <code>requests</code> module.  I am seeing this error in logs: </p>
  
  <pre><code>WARNING:requests.packages.urllib3.connectionpool:HttpConnectionPool is full, discarding connection:
  </code></pre>
  
  <p>What can I do to increase the size of the connection pool for requests?</p>