Xcode7.0之后, 设置允许HTTP请求

在我们创建工程, 通过网络链接下载图片的时候, 一旦出现如下错误信息, 肯定是忘记设置HTTP请求 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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