How to use the cheroot.errors function in cheroot

return call(*args, **kwargs)
            except SSL.WantReadError:
                # Sleep and try again. This is dangerous, because it means
                # the rest of the stack has no way of differentiating
                # between a "new handshake" error and "client dropped".
                # Note this isn't an endless loop: there's a timeout below.
                # Ref: https://stackoverflow.com/a/5133568/595220
                time.sleep(self.ssl_retry)
            except SSL.WantWriteError:
                time.sleep(self.ssl_retry)
            except SSL.SysCallError as e:
                if is_reader and e.args == (-1, 'Unexpected EOF'):
                    return b''

                errnum = e.args[0]
                if is_reader and errnum in errors.socket_errors_to_ignore:
                    return b''
                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()

if errnum in timeout_errs:
                # Don't error if we're between requests; only error
                # if 1) no request has been started at all, or 2) we're
                # in the middle of a request.
                # See https://github.com/cherrypy/cherrypy/issues/853
                if (not request_seen) or (req and req.started_request):
                    self._conditional_error(req, '408 Request Timeout')
            elif errnum not in errors.socket_errors_to_ignore:
                self.server.error_log(
                    'socket.error %s' % repr(errnum),
                    level=logging.WARNING, traceback=True,
                )
                self._conditional_error(req, '500 Internal Server Error')
        except (KeyboardInterrupt, SystemExit):
            raise
        except errors.FatalSSLAlert:
            pass
        except errors.NoSSLError:
            self._handle_no_ssl(req)
        except Exception as ex:
            self.server.error_log(
                repr(ex), level=logging.ERROR, traceback=True,
            )
            self._conditional_error(req, '500 Internal Server Error')
        return False

buf.append(b'Connection: close\r\n')
            else:
                # HTTP/1.0 had no 413/414 status nor Connection header.
                # Emit 400 instead and trust the message body is enough.
                status = '400 Bad Request'

        buf.append(CRLF)
        if msg:
            if isinstance(msg, six.text_type):
                msg = msg.encode('ISO-8859-1')
            buf.append(msg)

        try:
            self.conn.wfile.write(EMPTY.join(buf))
        except socket.error as ex:
            if ex.args[0] not in errors.socket_errors_to_ignore:
                raise