I have a WKWebView which should load the following url:
https://buchung.salonmeister.de/place/#offer-details-page?id=907599&venueId=301655
Add this to your plist
NSAppTransportSecurity NSAllowsArbitraryLoads
Here's the explanation for this change in 9.0 http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/
Also if you want to set it up more secure it gives you a more complex way to do that.