- the discussing requests assumed to connect to same target host
- "handles" -> I meant the return from curl_init()
- Even document from the CURLOPT_FORBID_REUSE option doesn't mention whether if not set that option, a connection reuse can happen across different curl handle or not.
I googled quite a lot, even CURL's official FAQ, but cannot find explicit answer.
Remark: related to question Reusing the same curl handle. Big performance increase?, but the accepted answer didn't answer it explicitly, and no official reference.