I just downloaded the latest version of xCode (9.0 beta (9M136h)).
However, when I try to make a request to my server in iOS 11 simulator (Using NSURLConnection send
You need to allow your application to run HTTP (no S) connections. By default, Apple only allows HTTPS:
go to your info.plist

then press the plus icon on any of them
Search for "App Transport Security Settings"

click the little arrow to the left and find "Allow arbitrary loads", by default it is set to "NO" change it to "YES"