节点js发布内容类型表单数据获取空响应

我试图使用节点js请求发布表单数据内容类型，但每次我得到响应'null'，我都可以这样做并使用帖子man得到正确的响应，我真的不知道是什么代码中有错，这是我的来源

var req = require('request');

req.post({
   url: 'url’,
   form: {request:[{"request":"context","sequence":0,"userToken":"mytokenxyz"}]},
   headers: { 
      'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36',
      'Content-Type' : 'application/x-www-form-urlencoded' 
   },
   method: 'POST'
  },

  function (e, r, body) {
      console.log(body); //here the body I am getting null
  });

这是邮递员截图，我得到了正确的答复。我尝试了许多其他方法，但最终得到了相同的null响应。

   Also try like that it can work




    "privilege":[
    {
        "role_id":1,
        "mod_id":1,
        "p_access":"ON",
        "p_insert":"ON",
        "p_updete":"ON",
        "p_delete":"ON",
        "created_by":1
    },
    {
        "role_id":1,
        "mod_id":1,
        "p_access":"ON",
        "p_insert":"ON",
        "p_updete":"ON",
        "p_delete":"ON",
        "created_by":1
    },
    {
        "role_id":1,
        "mod_id":1,
        "p_access":"ON",
        "p_insert":"ON",
        "p_updete":"ON",
        "p_delete":"ON",
        "created_by":1
    },
    {
        "role_id":1,
        "mod_id":1,
        "p_access":"ON",
        "p_insert":"ON",
        "p_updete":"ON",
        "p_delete":"ON",
        "created_by":1
    }]







    var obj = data['privilege'];
        for (var key in obj) {
            console.log(obj[key].role_id);
        }