How to use the cheroot.errors.FatalSSLAlert function in cheroot

raise socket.error(errnum)
            except SSL.Error as e:
                if is_reader and e.args == (-1, 'Unexpected EOF'):
                    return ''

                thirdarg = None
                try:
                    thirdarg = e.args[0][0][2]
                except IndexError:
                    pass

                if thirdarg == 'http request':
                    # The client is talking HTTP to an HTTPS server.
                    raise errors.NoSSLError()

                raise errors.FatalSSLAlert(*e.args)

            if time.time() - start > self.ssl_timeout:
                raise socket.timeout('timed out')

raise socket.error(errnum)
            except SSL.Error as e:
                if is_reader and e.args == (-1, 'Unexpected EOF'):
                    return b''

                thirdarg = None
                try:
                    thirdarg = e.args[0][0][2]
                except IndexError:
                    pass

                if thirdarg == 'http request':
                    # The client is talking HTTP to an HTTPS server.
                    raise errors.NoSSLError()

                raise errors.FatalSSLAlert(*e.args)

            if time.time() - start > self.ssl_timeout:
                raise socket.timeout('timed out')

def _conditional_error(self, req, response):
        """Respond with an error.

        Don't bother writing if a response
        has already started being written.
        """
        if not req or req.sent_headers:
            return

        try:
            req.simple_response(response)
        except errors.FatalSSLAlert:
            pass
        except errors.NoSSLError:
            self._handle_no_ssl(req)