无法从angular $ http方法访问Nodej上本地托管的POST服务

Question

我在nodejs服务器上本地托管了一个POST api服务，我想从我的angualrJS代码访问，但是我在控制台中收到错误 POST http://10.176.1.85:4242/createUser?action=add net :: ERR_CONNECTION_RESET

我的Node js代码是

app.post('/createUser', function(req, res) {

   connection.connect(function(err) {
    // ... error checks 
    console.dir(err);
    // Query 

    var request = new sql.Request();
    console.dir(request);
    console.dir(req.body);
    request.query("insert into dbo.Users (username,password,emailId) values ('" + req.body.username + "','" + req.body.password + "','" + req.body.email + "')", function(err, recordset,fields) {
        // ... error checks 

        console.dir(recordset);
        res.send(200);
     // res.send(err+recordset+fields+req.body.username+req.body.password+req.body.email);
     //connection.close();
    });



});

}）;

我的角色代码是

$http({
                        method: "post",
                        url: "http://localhost:4242/createUser",
                        params: {
                            action: "add"
                        },
                        data: {
                            name: userDetails
                        }
                    }).then(function (response) {

                        return "Done";
                    }, function(error) {
                        return q.reject(error.data);
                    });