Hey Meaton, I didn't make it clear, the size we want to control is "client TCP window size", rather than the "server TCP window size" or "H2". We used libCurl to test and get an initial 64KB client TCP window size which is much bigger than "BackgroundDownloadTask".

Emmmm...sounds like a feature request? To make debugging infrastructure not forward the message when a breakpoint is put to the read system. :awesome: