log_format access-upstream '$time_iso8601|$request|$remote_addr|$upstream_response_time|$http_user_agent|$http_x_forwarded_for';
map $time_iso8601 $logdate {
'~^(?<ymd>\d{4}-\d{2}-\d{2})' $ymd;
default 'date-not-found';
}
access_log logs/access-$logdate.log ;
# access_log off; # 实在不需要的话，可以将其关闭（如心跳请求，会记录日志）
