否請求的資源上存在'Access-Control-Allow-Origin'標頭。 NodeJS和AngularJS應用程序

我已經閱讀了所有上述鏈接，但它仍然無法解決我的問題。節點代碼否請求的資源上存在'Access-Control-Allow-Origin'標頭。 NodeJS和AngularJS應用程序

app.all('*', (req, res, next) => { 
    let allowedOrigins = ['http://localhost:8080', 'http://127.0.0.1:8080']; 
    let origin = req.headers.origin; 
    if (allowedOrigins.indexOf(origin) > -1) { 
     console.log(origin); 
     res.setHeader('Access-Control-Allow-Origin', 'http://127.0.0.1:8080'); 
    } 
    res.set('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type'); 
    res.set('Access-Control-Allow-Credentials', 'true'); 
    res.set('Access-Control-Allow-Methods', "GET,POST,PUT,OPTIONS,DELETE"); 
    next(); 
});

angularJS

app.config(function($httpProvider) { 
    $httpProvider.defaults.withCredentials = true; 
    $httpProvider.defaults.useXDomain = true; 
});

其實我打的網址，它返回我200 OK響應爲好，但它仍然失敗，這樣的消息。我已經嘗試了很多博客和答案，但似乎沒有任何幫助，每個人都重申了我已經嘗試過的同樣的事情。消息失敗與

XMLHttpRequest cannot load http://localhost:5040/save. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' is therefore not allowed access.

來源

2017-01-21 Karan Jariwala