Xcode7.0之後, 設置允許HTTP請求

在我們創建工程, 通過網絡鏈接下載圖片的時候, 一旦出現如下錯誤信息, 肯定是忘記設置HTTP請求 App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app'

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