title: How do we specify TLS/SSL options in Guzzle?
body: <p>We are starting to use Guzzle in PHP with code which calls a variety of different APIs, a few of which don't support TLSv1.2 and some of which require TLSv1.2.</p>
  
  <p>What's the best way to force Guzzle to use the most recent protocol available, except in cases where we know it won't be recognized?</p>