title: connection timeout error in urllib3 in python
body: <p>I am investigating for default value for timeout in urllib in python.
  The default value for timeout is <strong>socket._GLOBAL_DEFAULT_TIMEOUT</strong> and has Value <strong>None</strong>.None means Infinite timeout but what will be the minimum timeout time between retries.</p>
  
  <p>What is default value of GLOBAL_DEFAULT_TIMEOUT?</p>
  
  <p>Thanks in Advance</p>