def error_response(
self,
formatter: Formatter,
status_code: bytes,
status_phrase: bytes,
message: str,
log_message: str = None,
) -> None:
"""Send an error response."""
if self.timeout:
self.timeout.delete()
self.timeout = None
self.exchange.response_start(
status_code,
status_phrase,
[
(b"Content-Type", formatter.content_type()),
(b"Cache-Control", b"max-age=60, must-revalidate"),
],
)
formatter.start_output()
formatter.error_output(message)
self.exchange.response_done([])
if log_message:
self.error_log(log_message)
