https://bugs.winehq.org/show_bug.cgi?id=35953
--- Comment #8 from Chiitoo escomk3@hotmail.com --- Over at IRC, vpovirk asked if I had yet taken a look with Wireshark, which I had been thinking of, but tried to avoid since I don't much have know-how on those parts, yet, but I guess I shouldn't keep avoiding it and did take a quick look-see!
Using the built-in winehttp, the connection doesn't seem to get reset; there is no [RST, ACK] while it is there when using native.
Instead, built-in seems to keep listening, and indeed does receive an extra [FIN, ACK], but I've no idea really what to make of it, if anything.
I ran only a few tests so far, but I do hope this is already something of note!