当我调用login API时，我得到跨源读取阻塞（CORB）阻塞的跨源响应****MIME类型的application/json，并且我无法验证用户。每当我尝试登录用户时，CORB阻塞我的http请求，并且我无法验证用户。我是ionic的新手，因此我无法解决此错误，如有任何帮助，将不胜感激

if (this.plugins.isOnline()) {
            if (this.wait == true) {
                return;
            } else if (this.userLogin.email == '' || this.userLogin.password == '') {
                this.utility.doToast("Please don't leave any field blank.");
                return;
            } else {
                this.wait = true;
                // this.getRequiremensts();
                this.auth.login(this.userLogin).subscribe((success) => {
                    this.wait = false;
                    console.log("loginData",success.successData);
                    this.credential.setUser(success.successData);
                    // this.plugins.sendTags(success.successData.id);
                    this.rememberUsertype(success.successData.is_celebrity);
                    if(success.successData.is_celebrity == '0'){
                    this.app.getRootNav().setRoot("HomePage");
                    }
                    else if(success.successData.is_celebrity == '1'){
                    this.app.getRootNav().setRoot("DashboardPage");
                     }

                    }, (error) => {
                        console.log(error);
                    this.wait = false;
                    if (this.utility.timeOutResponse(error))
                        this.utility.doToast("The email or password you entered is incorrect.")
                })
            }
        } else {
            this.utility.doToast(this.utility.internetConnectionMessage());
        }


login(params) {

        var url = this.constants.API_ENDPOINT + 'login';
        var response = this.http.post(url, params, {}).map(res => res.json());
        return response;
    }

 if (options == null) {
            options = new RequestOptions();
        }
        if (options.headers == null) {
            options.headers = new Headers();
        }
        options.headers.append('app_key', 'Some App Key');

        var _token = localStorage.getItem('token');
        if (_token)
            options.headers.set('session_token', _token);

        options.headers.set("Cache-Control", "no-cache");

        return options; 
    }

误差

SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at Response.Body.json (http.js:1091)
    at MapSubscriber.project (auth.service.ts:29)
    at MapSubscriber._next (map.js:79)
    at MapSubscriber.Subscriber.next (Subscriber.js:93)
    at CatchSubscriber.Subscriber._next (Subscriber.js:129)
    at CatchSubscriber.Subscriber.next (Subscriber.js:93)
    at TimeoutSubscriber.Subscriber._next (Subscriber.js:129)
    at TimeoutSubscriber._next (timeout.js:132)
    at TimeoutSubscriber.Subscriber.next (Subscriber.js:93)