默认的header是类似这样的

User-Agent: Fiddler 
Host: localhost 
Content-Length: 34

只需要改成这样的

User-Agent: Fiddler 
Content-Type: application/x-www-form-urlencoded 
Host: localhost 
Content-Length: 34

city='dfdafdsfsaf'&mm="1232323123"

神马，还想传JSON？，so easy，把header里改成这样

User-Agent: Fiddler 
Content-Type: application/json 
Host: localhost
requset body里就这么写



{     
  "city": "dfdafdsfsaf",     
  "mm": "1232323123" 
}
在Http中，POST参数的请求格式是由Content-type选项控制的。比较常见两种Content-type选项和数据格式我用下表列出：

content-type                        参数格式     
application/x-www-form-urlencoded   info=10001030A&itme=wwwdn_06RMB
application/json                    {"info":"10001030A","item":"wwwdn_06RMB"}