为什么swift解析.getDataInBackgroundWithBlock被阻止为明文http请求？

I'm writing a swift iOS app that uses Parse hosted on Heroku. As far as I know, all data transport is over HTTPS and I do not have the App Transport Security workaround done to info.plist (and intends to keep it that way). Up until now all Parse queries have executed without errors both on the simulator and on actual iphone running 9.3.3 or 9.3.5.I'm writing a swift iOS app that uses Parse hos