new_contents: __all__ = [
      'make_ssl_context',
  ]
  
  import ssl
  
  
  def make_ssl_context(crt, key):
      ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
      ssl_context.load_cert_chain(crt, key)
      if ssl.HAS_ALPN:
          ssl_context.set_alpn_protocols(['h2'])
      else:
          asserts.precond(ssl.HAS_NPN)
          ssl_context.set_npn_protocols(['h2'])
      return ssl_context
  
subject: Add helper for HTTP/2 SSL context