curl 错误 "Expire in 1 ms for 1 (transfer 0x...)"

Question

我打开了一个 PHP 脚本并通过 curl 解析了许多 RSS 提要。正在尝试阅读其中之一，CURLOPT_STDERR返回以下错误:

* Expire in 0 ms for 6 (transfer 0x558820d06dc0)
* Expire in 1 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
* Expire in 1 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
* Expire in 1 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
* Expire in 1 ms for 1 (transfer 0x558820d06dc0)
* Expire in 0 ms for 1 (transfer 0x558820d06dc0)
... and so on for more than a hundred lines

一个小时后，我得到同样的错误，只有“转移”后面的数字发生了变化。再过一个小时就可以成功读取提要(无需对我的代码进行任何更改)。
这个错误是什么意思？

Answer 1

它不是错误消息，而是日志输出中的信息性消息 - 并且是错误地留在那里并已被删除的消息。在 7.64.1 及更高版本中消失。