POST接口时头部参数如下：
User-Agent: Fiddler Host: api.***.com Content-Length: 73 Content-Type: application/json
Request Body应该如下传递参数：
{"category":"9","sort_key":"0","sort_value":"0","page":"1","per_page":10}
原文：http://www.cnblogs.com/firstcsharp/p/7586243.html