code: def remove_sni_cert(self, hostname):
  		
  		if not g_ssl_has_server_sni:
  			raise RuntimeError('the ssl server name indicator extension is unavailable')
  		if self._ssl_sni_entries is None:
  			raise RuntimeError('ssl was not enabled on initialization')
  		sni_entry = self._ssl_sni_entries.pop(hostname, None)
  		if sni_entry is None:
  			raise ValueError('the specified hostname does not have an sni certificate configuration')
docs: Remove the SSL Server Name Indicator (SNI) certificate configuration for
  		the specified *hostname*.
  
  		.. warning::
  
  			This method will raise a :py:exc:`RuntimeError` if either the SNI
  			extension is not available in the :py:mod:`ssl` module or if SSL was
  			not enabled at initialization time through the use of arguments to
  			:py:meth:`~.__init__`.
  
  		.. versionadded:: 2.2.0
  
  		:param str hostname: The hostname to delete the SNI configuration for.