沒什麼好說的，重點看上面填的東西，Content-Type: application/x-www-form-urlencoded
通常要自己加上去

服務端接收引數

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;

namespace Zewei.Police.Api.Controllers
{
    public class LoginController : ApiController
    {
        [HttpPost]
        public
 
 void Login()
        {
            HttpContextBase context = (HttpContextBase)Request.Properties["MS_HttpContext"];//獲取傳統context
            HttpRequestBase request = context.Request;//定義傳統request物件
            string userName = request.Form["Param1"];
            string mobile = request.Form["Param2"];
        }
    }
}
 

Fiddler模擬請求，這篇寫的很好，可以參考