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

　　ios进行http请求，会出现这个问题：

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

解决办法：在工程文件*.plist中进行配置，截图如下：

用记事本打开工程文件，为：

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

经查，原因是iOS9引入了新特性App Transport Security (ATS)。详情：App Transport Security (ATS)

新特性要求App内访问的网络必须使用HTTPS协议，所以若能使用https尽量使用https。

参考文档：https://segmentfault.com/a/1190000002933776

原文链接：http://www.cnblogs.com/tandaxia/p/5193081.html