node.js – 无效的oauth2令牌请求

error: 400
{ 
  "error" : "invalid_request"
}

var request = require('request');
var token_request='code='+req['query']['code']+
                  '&client_id={Client iD}'+
                  '&client_secret={Client secret}'+
                  '&redirect_uri=http%3A%2F%2Fmassiveboom.com:3000'+
                  '&grant_type=authorization_code';
request(
    { method: 'POST',uri:'https://accounts.google.com/o/oauth2/token',body: token_request
    },function (error,response,body) {
        if(response.statusCode == 201){
            console.log('document fetched');
            console.log(body);
        } else {
            console.log('error: '+ response.statusCodE);
            console.log(body);
        }
    });

事实证明,request.js(https://github.com/mikeal/request)不会自动将内容长度包含在标题中.我手动添加它,它在第一次尝试时工作.我已粘贴以下代码：

exports.get_token = function(req,success,fail){
    var token;
    var request = require('request');
    var credentials = require('../config/credentials');
    var google_credentials=credentials.fetch('google');
    var token_request='code='+req['query']['code']+
        '&client_id='+google_credentials['client_id']+
        '&client_secret='+google_credentials['client_secret']+
        '&redirect_uri=http%3A%2F%2Fmyurl.com:3000%2Fauth'+
        '&grant_type=authorization_code';
    var request_length = token_request.length;
    console.log("requesTing: "+token_request);
    request(
        { method: 'POST',headers: {'Content-length': request_length,'Content-type':'application/x-www-form-urlencoded'},body: token_request
        },body) {
            if(response.statusCode == 200){
                console.log('document fetched');
                token=bodY['access_token'];
                store_token(body);
                if(success){
                    success(token);
                }
            }
            else {
                console.log('error: '+ response.statusCodE);
                console.log(body)
                if(fail){
                    fail();
                }
            }
        }
    );
}