Retry failed requests with $http interceptor

Question

The API my webapp is talking to sometimes overloads and is sending 500 Internal Server Error if it cannot handle request.

There are 100+ different requests my web applic

Answer 1

I wanted to retry requests in my response block also, so combining multiple answers from different posts from SO, I've written my interceptor as follows -

app.config(['$httpProvider', function ($httpProvider) {
    $httpProvider.interceptors.push(['$rootScope', '$cookies', '$q', '$injector', function ($rootScope, $cookies, $q, $injector) {
        var retries = 0, maxRetries = 3;

        return {
            request: function (config) {
                var csrf = $cookies.get("CSRF-Token");
                config.headers['X-CSRF-Token'] = csrf;
                if (config.data) config.data['CSRF-Token'] = csrf;
                return config;
            },
            response: function (r) {
                if (r.data.rCode == "000") {
                    $rootScope.serviceError = true;
                    if (retries < maxRetries) {
                        retries++;
                        var $http = $injector.get('$http');
                        return $http(r.config);
                    } else {
                        console.log('The remote server seems to be busy at the moment. Please try again in 5 minutes');
                    }
                }
                return r;
            },
            responseError: function (r) {
                if (r.status === 500) {
                    if (retries < maxRetries) {
                        retries++;
                        var $http = $injector.get('$http');
                        return $http(r.config);
                    } else {
                        console.log('The remote server seems to be busy at the moment. Please try again in 5 minutes');
                    }
                }

                retries = 0;
                return $q.reject(r);
            }
        }
    }]);
}])

credits to @S.Klechkovski, @Cameron & https://stackoverflow.com/a/20915196/5729813