https://bugs.winehq.org/show_bug.cgi?id=45299
--- Comment #2 from Hans Leidekker hans@meelstraat.net --- (In reply to Fabian Maurer from comment #1)
Bisected to commit 5226865c5324f366ad6974ddb8291adc20759019 Author: Jacek Caban jacek@codeweavers.com Date: Tue Jul 18 00:25:15 2017 +0200
winhttp: Cache and reuse persistent HTTP connections.
However, it doesn't revert cleanly, there were other changes in the same code.
The problem is that the connection object is moved to the connection cache when we're finished reading data while the flash player installer wants to retrieve the server certificate after consuming the data.