javascript - 在飞行前响应中，Access-Control-Allow-Headers不允许Angularjs请求 header 字段Access-Control-Allow-Headers

我知道有很多重复的问题。我尝试了那里给出的所有解决方案，但仍然无法正常工作。


  XMLHttpRequest无法加载http://localhost:3000/api/create。在飞行前响应中，Access-Control-Allow-Headers不允许请求标头字段Access-Control-Allow-Headers。
  
  angularjs代码

$httpProvider.defaults.headers.common = {};
        $httpProvider.defaults.headers.post = {};
        $httpProvider.defaults.headers.put = {};
        $httpProvider.defaults.headers.patch = {};
        $httpProvider.defaults.headers.get = {};
        $httpProvider.defaults.headers.common['Access-Control-Allow-     Headers'] = '*';
        $httpProvider.defaults.useXDomain = true;
        delete $httpProvider.defaults.headers.common['X-Requested-With'];

        $httpProvider.interceptors.push(['$injector',function($injector) {
            var mainFactory = $injector.get('mainFactory');
            return {
                request: function(config) {
                    var token = mainFactory.getToken();
                    config.headers.Authorization = 'Basic '+token;
                    return config;
                },

                response: function(response) {
                    return response;
                }
            };
}]);

  nodejs代码

app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header('Access-Control-Allow-Methods','GET,PUT,POST,DELETE,OPTIONS');
res.header('Access-Control-Allow-Headers','Content-Type,Authorization');
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Accept");
next();
});

最佳答案

感谢您的评论。我通过安装npm软件包cors修复了它。我认为错误是在服务器端出现的，例如@ Katana314。

    $httpProvider.defaults.headers.common = {};
    $httpProvider.defaults.headers.post = {};
    $httpProvider.defaults.headers.put = {};
    $httpProvider.defaults.headers.patch = {};
    $httpProvider.defaults.headers.get = {};
    $httpProvider.defaults.headers.common['Access-Control-Allow-Headers'] = '*';
    $httpProvider.defaults.useXDomain = true;
    delete $httpProvider.defaults.headers.common['X-Requested-With'];

  所有这些默认标头也可以删除。