XCode7 新建的项目,要求使用HTTPS协议
HTTP+SSL/TLS+TCP = HTTPS
也就是说，服务需要提供HTTPS(TLS 1.2)的接口；
如果服务不改变，则需要在info.plist中加入下面的键值，用来信任所有HTTP服务器
<key>NSAllowsArbitraryLoads</key>
<true/>
<key>NSAppTransportSecurity</key>
<dict>
<!--Connect to anything (this is probably BAD)-->
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
或者严谨的
<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<!--Include to allow subdomains-->
<key>NSIncludesSubdomains</key>
<true/>
<!--Include to allow insecure HTTP requests-->
<key>NSTemporaryExceptionAllowsInsecureHTTPLoads<key>
<true/>
<!--Include to specify minimum TLS version-->
<key>NSTemporaryExceptionMinimumTLSVersion</key>
<string>TLSv1.1</string>
</dict>
</dict>
</dict>
