在angularjs拦截器中停止请求

Question

如何在Angularjs拦截器中停止请求.

有没有办法做到这一点？

我尝试使用promises并发送拒绝而不是解决!

.factory('connectionInterceptor', ['$q', '$timeout',
   function($q, $timeout) {
    var connectionInterceptor = {
        request: function(config) {
            var q = $q.defer();
            $timeout(function() {
                q.reject();
            }, 2000)
            return q.promise;
            // return config;
        }
    }
    return connectionInterceptor;
  }
])
.config(function($httpProvider) {
   $httpProvider.interceptors.push('connectionInterceptor');
});

Answer 1

$ http服务有一个选项 超时来完成这项工作.你可以这样做:

angular.module('myApp')
    .factory('httpInterceptor', ['$q', '$location',function ($q, $location) {
        var canceller = $q.defer();
        return {
            'request': function(config) {
                // promise that should abort the request when resolved.
                config.timeout = canceller.promise;
                return config;
            },
            'response': function(response) {
                return response;
            },
            'responseError': function(rejection) {
                if (rejection.status === 401) {
                    canceller.resolve('Unauthorized'); 
                    $location.url('/user/signin');
                }
                if (rejection.status === 403) {
                    canceller.resolve('Forbidden');  
                    $location.url('/');
                }
                return $q.reject(rejection);
            }

        };
    }
    ])
    //Http Intercpetor to check auth failures for xhr requests
   .config(['$httpProvider',function($httpProvider) {
        $httpProvider.interceptors.push('httpInterceptor');
    }]);

Answer 2

我最终绕过带有以下角度拦截器的角度XHR调用:

function HttpSessionExpiredInterceptor(sessionService) {
    return {
        request: function(config) {
            if (sessionService.hasExpired()) {
                /* Avoid any other XHR call. Trick angular into thinking it's a GET request.
                 * This way the caching mechanism can kick in and bypass the XHR call.
                 * We return an empty response because, at this point, we do not care about the
                 * behaviour of the app. */
                if (_.startsWith(config.url, '/your-app-base-path/')) {
                    config.method = 'GET';
                    config.cache = {
                        get: function() {
                            return null;
                        }
                    };
                }
            }

            return config;
        }
    };
}

这样,任何请求,POST,PUT,...都被转换为GET,以便角度可以使用缓存机制.此时,您可以使用自己的缓存机制,在我的情况下,当会话到期时,我不再关心返回什么.

Answer 3

不确定一般情况下是否可行。但是您可以使用“取消器”启动 $http 请求。

这是这个答案的一个例子：

var canceler = $q.defer();
$http.get('/someUrl', {timeout: canceler.promise}).success(successCallback);
// later...
canceler.resolve();  // Aborts the $http request if it isn't finished.

因此，如果您可以控制发起请求的方式，这可能是一个选择。