title: Python Requests - Use TLS v.1_3
body: <p>I am trying to make a request in Python using TLS 1.3 as it is what the site accepts.
  I use following code:</p>
  
  <pre><code>import requests
  from requests.adapters import HTTPAdapter
  from requests.packages.urllib3.poolmanager import PoolManager
  from requests.packages.urllib3.util import ssl_
  
  CIPHERS = (
      'AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:AES256-SHA'
  )
  
  
  class TlsAdapter(HTTPAdapter):
  
      def __init__(self, ssl_options=0, **kwargs):
          self.ssl_options = ssl_options
          super(TlsAdapter, self).__init__(**kwargs)
  
      def init_poolmanager(self, *pool_args, **pool_kwargs):
          ctx = ssl_.create_urllib3_context(ciphers=CIPHERS, cert_reqs=ssl.CERT_REQUIRED, options=self.ssl_options)
          self.poolmanager = PoolManager(*pool_args,
                                         ssl_context=ctx,
                                         **pool_kwargs)
  
  
  sess = requests.session()
  adp = TlsAdapter(ssl.OP_NO_TLSv1_3 | ssl.OP_NO_TLSv1_3)
  sess.mount("https://", adapter)
  </code></pre>
  
  <p>Everything looks fine until here. I started using it to send requests ecc but of pure curiosity I checked deeper and used Wireshark. Here it says the requests go over 1.2 and not 1.3. </p>
  
  <p>Anyone could help me actually to enforce 1.3 and not 1.2? It would be very appreciated. Thanks.</p>