I did this

I found the new upkeep API in the latest curl version: curl_easy_upkeep()

I expected the following

A corresponding multi API to keep up connections that are managed by a multi handle (curl_multi_upkeep).

Or maybe curl_multi_perform() already does these "upkeep" tasks? (even if all transfers have completed...?)

Probably also a corresponding share API is needed (curl_share_upkeep) because the connection cache can be shared.

curl/libcurl version

7.62.0