The new ATS involved by iOS 9 cause lots of http related functionalities stop working. I have to add all the http request url into a whitelist or I could simply disable the
UPDATE: Apple will reject Apps not conforming to ATS after the end of Dec 2016.
Source
However, If you need to load a http://
resource only in web (UIWebView/WKWebView/SafariViewController) then the following should suffice.
NOTE: This key is available only from iOS 10.
NSAppTransportSecurity
NSAllowsArbitraryLoadsInWebContent