Http status is randomly 0 when looping request

Http status code is zero when looping request. Use attached modified Qt http example to see issue and following log. There's 1 sec interval loop to https://qt-project.org. Might need also shorten interval. So it's timing issue.

status 200
status 200
status 0
status 200
status 0
status 200
status 200
status 200
status 200
status 0
status 200
status 200
status 200