App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.
在iOS9 beta1中，苹果将原http协议改成了https协议，使用 TLS1.2 SSL加密请求数据。
解决办法：在info.plist中添加
NSAppTransportSecurity
NSAllowsArbitraryLoads
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