如何在Angular 7中调用Yii2的RESTAPI

我有一个Angular服务，它进行API调用。这是我的

subscribe.service.ts

文件

    import { Injectable } from '@angular/core';
    import { HttpClient } from '@angular/common/http'

    @Injectable({
      providedIn: 'root'
    })
    export class SubscribeService {
      readonly postURL = "http://localhost/sampleproject/frontend/web/api/subscribe";
      constructor(private http:HttpClient) { }

      subscribeSubmit(subscriber){
       return this.http.post(this.postURL, subscriber);
      }
    }

            <?php
        namespace frontend\controllers;
        use Yii;
        use yii\web\Controller;

        class ApiController extends Controller {
            public $enableCsrfValidation = false;
            public static function allowedDomains() {
            return [
                 '*',                       
            ];
        }

            public function behaviors() {
            return array_merge(parent::behaviors(), [
                'corsFilter'  => [
                    'class' => \yii\filters\Cors::className(),
                    'cors'  => [
                        'Origin'                           => static::allowedDomains(),
                        'Access-Control-Request-Method'    => ['POST'],
                        'Access-Control-Allow-Credentials' => true,
                        'Access-Control-Max-Age'           => 3600,       
                    ],
                ],

            ]);
        }

             public function beforeAction($action) {
                if (\Yii::$app->getUser()->isGuest &&
                    \Yii::$app->getRequest()->url !== \yii\helpers\Url::to(\Yii::$app->getUser()->loginUrl) && Yii::$app->controller->action->id != 'subscribeforangular') {
                    \Yii::$app->getResponse()->redirect(Yii::$app->request->BaseUrl . '/../../login');
                }
                else {
                    return parent::beforeAction($action);
                }
            }

            public function actionSubscribe(){
                print_r($_POST);
            }

        }

被称为API的postrl在yii2中。下面是我的

ApiController.php

文件

    import { Injectable } from '@angular/core';
    import { HttpClient } from '@angular/common/http'

    @Injectable({
      providedIn: 'root'
    })
    export class SubscribeService {
      readonly postURL = "http://localhost/sampleproject/frontend/web/api/subscribe";
      constructor(private http:HttpClient) { }

      subscribeSubmit(subscriber){
       return this.http.post(this.postURL, subscriber);
      }
    }

            <?php
        namespace frontend\controllers;
        use Yii;
        use yii\web\Controller;

        class ApiController extends Controller {
            public $enableCsrfValidation = false;
            public static function allowedDomains() {
            return [
                 '*',                       
            ];
        }

            public function behaviors() {
            return array_merge(parent::behaviors(), [
                'corsFilter'  => [
                    'class' => \yii\filters\Cors::className(),
                    'cors'  => [
                        'Origin'                           => static::allowedDomains(),
                        'Access-Control-Request-Method'    => ['POST'],
                        'Access-Control-Allow-Credentials' => true,
                        'Access-Control-Max-Age'           => 3600,       
                    ],
                ],

            ]);
        }

             public function beforeAction($action) {
                if (\Yii::$app->getUser()->isGuest &&
                    \Yii::$app->getRequest()->url !== \yii\helpers\Url::to(\Yii::$app->getUser()->loginUrl) && Yii::$app->controller->action->id != 'subscribeforangular') {
                    \Yii::$app->getResponse()->redirect(Yii::$app->request->BaseUrl . '/../../login');
                }
                else {
                    return parent::beforeAction($action);
                }
            }

            public function actionSubscribe(){
                print_r($_POST);
            }

        }

当我在控制台中签入“网络”时，下面的几行并没有被添加，这表示CORS并没有使用我在controller中编写的内容实现。 根据我的研发，必须在“”中添加以下行

我已经在谷歌上搜索了解决方案并实现了它们，但在所有情况下我仍然会得到相同的错误

---

请帮忙！！我已经试了两天了。我找不到合适的解决方案，因此发布在这里。

我没有任何使用angular的经验，但是使用javascript，您需要随请求一起提供标题，并且您应该正确配置服务器端请参见和