RT，直接访问会提示：
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.
解决方法有2种：
参考自：http://stackoverflow.com/questions/31254725/transport-security-has-blocked-a-cleartext-http
See the developer forums: https://forums.developer.apple.com/thread/3544
Also this page: http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/
推荐解法，添加域名的白名单：
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>yourserver.com</key>
<dict>
<!--Include to allow subdomains-->
<key>NSIncludesSubdomains</key>
<true/>
<!--Include to allow HTTP requests-->
<key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
<true/>
<!--Include to specify minimum TLS version-->
<key>NSTemporaryExceptionMinimumTLSVersion</key>
<string>TLSv1.1</string>
</dict>
</dict>
</dict>
不推荐解法，允许全部HTTP请求：
<key>NSAppTransportSecurity</key>
<dict>
<!--Include to allow all connections (DANGER)-->
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
Note:
info.plist is an xml file so you can place this code more or less anywhere inside the file