Cannot do request with non HTTPS url

Question

I'm just porting my app to IOS 11. Now my mroblem is that i always getting an NSError with NSURLConnection: "The resource could not be loaded because the App Transport Security policy requires the use of a secure connection."

Adding following to the plist.info does not help either:

 <key>NSAppTransportSecurity</key>                                                                                                                                                                                                                                       
 <dict>                                                                                                                                                                                                                                                                  
     <key>NSAllowsArbitraryLoads</key>                                                                                                                                                                                                                                   
     <true/>                                                                                                                                                                                                                                                             
 </dict>   

Does Apple requires https connections for Ios 11 now? I've only found articles saying it starts from January 2016, but my app still works without any problems. With Xcode9 , Ios11 beta i cannot get it work. Haven't found any informations about https and Ios11.

Many thanks in advance