Question

在发出HTTP请求之前，我需要检查我拥有的访问凭据是否有效。如果它们无效，我需要发出第一个HTTP请求来重新验证它们，并在完成后再发出第二个HTTP请求（原始请求）。函数调用需要从第二个HTTP请求返回Angular的$http承诺。这是我的职责：

var makeRequest = function (scope, address, request, basic, form) {

        startLoad(scope); 

        // Check if user is logged in and needs a new session token...
        if (ready() && (now() > getSessionExpires()-20) ) {

            // Setup auth.session.refresh request
            var refreshRequest = {
                "refreshToken": getRefreshToken(),
                "clientID": getClientID(),
            };

            // Make auth.session.refresh request
            $http.post(API + 'auth.session.refresh', format(refreshRequest))
                .error(function (data) {
                    // If refresh request fails, logout and redirect to expired message
                    stopLoad(scope); logoff();
                    $window.location.href = '/error/expired';
                    return;
                })
                .success(function (data) {
                    // If refresh request succeeds, makeRequest is called recursively and the else condition runs
                    process(data, true);
                    return makeRequest(scope, address, request, basic, form);
                });

        } else { // if not logged in, or if session token is valid, run request function as usual

            // Add Authorization header with valid sessionToken
            if (ready()) $http.defaults.headers.post['Authorization'] = 'Bearer ' + getSessionToken();

            // Basic Request: returns promise (if next context not set, can chain other action)
            if (basic) {
                return $http.post(API + address, request)
                    .error(function(data) {

                        if (data && scope) stopLoad(scope, data.message);
                        else if (scope) stopLoad(scope, Defaults.serverError);
                        else stopLoad();

                        if (form) resetForm(form);
                     })
                    .success(function(data) {
                        process(data);

                        if (scope) {
                            stopLoad(scope);
                            if (scope.context.next) $location.path(scope.context.next);
                        } else stopLoad();

                        if (form) resetForm(form);
                    });
            }

            // Custom Request: returns promise (can chain .error, .success)
            else return $http.post(API + address, request);
        }
    };

然而，当发现令牌无效时，该函数返回undefined，并且我得到一个错误，我无法运行.success（）或.error（）。其他功能运行，但我想知道如何确保我不会收到此错误。谢谢！

Answer 1

只需返回上方parent:hover { property }并让承诺链接做它的魔力：

$http.post(/*...*/)

更新，因为return $http.post(API + 'auth.session.refresh', format(refreshRequest)) .catch(function (response) { // If refresh request fails, logout and redirect to expired message stopLoad(scope); logoff(); $window.location.href = '/error/expired'; }) .then(function (response) { // If refresh request succeeds, makeRequest is called recursively and the else condition runs process(response.data, true); return makeRequest(scope, address, request, basic, form); }); / .success函数不可链接（并且已被标记为deprecated），您应该使用.error和{ {1}}而不是。

.then

成为

.catch

链2 HTTP请求并返回第二个承诺

1 个答案: