Xcode7 使用NSURLSession发送HTTP请求的问题

Xcode升级到了7.0之后，原先没有异常的程序也出现了如下报错：

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 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。

详细参考：https://developer.apple.com/library/prerelease/ios/releasenotes/General/WhatsNewIniOS/Articles/iOS9.html

解决办法：

在info.plist中添加

<key>NSAppTransportSecurity</key>

<dict>

    <key>NSAllowsArbitraryLoads</key>

    <true/>

</dict>