title: Python/Gunicorn ssl handshake failure
body: <p>I am running Ubuntu, Python 3.6, Gunicorn + Flask with an SSL cert. I occasionally get an error message about an invalid SSL request.</p>
  <pre><code>[2020-08-28 13:48:33 -0400] [6347] [DEBUG] Error processing SSL request.
  [2020-08-28 13:48:33 -0400] [6347] [DEBUG] Invalid request from ip=x.xx.xx.xx: [SSL: SSL_HANDSHAKE_FAILURE] ssl handshake failure (_ssl.c:2309)
  [2020-08-28 13:48:33 -0400] [6347] [DEBUG] Failed to send error message.
  </code></pre>
  <p>I believe it may have to do with the disk, as it is a pretty severe bottleneck on this machine. Maybe it's unable to read the cert in time because of disk?</p>
  <p>I set up Gunicorn with a standard SSL setup:</p>
  <pre class="lang-py prettyprint-override"><code>keyfile = 'keys/x.key'
  certfile = 'keys/x.pem'
  ca_certs = 'keys/x2.pem'
  </code></pre>