WinINet is the name of the Windows API for making URL-based network connections.
Maximum number of simultaneous HTTP 1.0 connections that Wininet allows to a single server: 4
Maximum number of HTTP 1.1 connections: 2
Times this limitation is mentioned in the Wininet documentation: 0
ID of the Microsoft Knowlege Base Article describing this limitation: 183110
Hours we’ve spent over the last few months debugging intermittent performance problems caused by this limitation: I don’t want to think about it.
Time it took to find the KB article after Googling for just “wininet”: about 15 seconds
If I weren’t so happy to have solved the problem, I’d be really upset right now.