控制台打印的错误信息：
Application 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.
//这是ios 9更新后，苹果将http请求换为了https请求了，解决方案如下：
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
swift--Xcode7 使用Alamofire框架发送HTTP请求报错
原文：http://www.cnblogs.com/brance/p/5000090.html