CURL error "Expire in 1 ms for 1 (transfer 0x...)"

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I'm having a PHP script open and parse a number of RSS-feeds via curl. Attempting to read one of them, CURLOPT_STDERR returned the following error:

* 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

An hour later I get the same error, only the number behind "transfer" has changed. Another hour later the feed can be read successfully (without any changes to my code).

What does that error mean?

curl
2 Answers

It is not an error message, it was an informational message in the log output - and one that was left there by mistake and has since been removed. Gone in 7.64.1 and later.

user_937470
user_1731490
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