Yii2 cors过滤错误,表示没有'Access-Control-Allow-Origin'标头

以下这个问题我将我的休息控制器行为设置为

public function behaviors()
{
    $behaviors = parent::behaviors();

    $auth= $behaviors['authenticator'] = [
        'class' => HttpBearerAuth::className(),
        'only' => ['dashboard'],
    ];
    $behaviors['contentNegotiator'] = [
        'class' => ContentNegotiator::className(),
        'formats' => [
            'application/json' => Response::FORMAT_JSON,
        ],
    ];
    $acces=$behaviors['access'] = [
        'class' => AccessControl::className(),
        'only' => ['login'],
        'rules' => [
            [
                'actions' => ['login'],
                'allow' => true,
                'roles' => ['?'],
            ],
        ],
    ];

    unset($behaviors['authenticator']);
    unset($behaviors['access']);

现在,cors过滤器

    // add CORS filter
    $behaviors['corsFilter'] = [
        'class' => \yii\filters\Cors::className(),
          'cors' => [
        // restrict access to
        'Access-Control-Allow-Origin' => ['*'],
        'Access-Control-Request-Method' => ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS'],
        // Allow only POST and PUT methods
        'Access-Control-Request-Headers' => ['*'],
        // Allow only headers 'X-Wsse'
        'Access-Control-Allow-Credentials' => true,
        // Allow OPTIONS caching
        'Access-Control-Max-Age' => 86400,
        // Allow the X-Pagination-Current-Page header to be exposed to the browser.
        'Access-Control-Expose-Headers' => [],
      ]
    ];

    // re-add authentication filter
    $behaviors['authenticator'] = $auth;
       $behaviors['access'] = $access;
    // avoid authentication on CORS-pre-flight requests (HTTP OPTIONS method)
    $behaviors['authenticator']['except'] = ['options'];
    return $behaviors;
}

我的angular2前端是

    const body = JSON.stringify(user);
let headers = new Headers();
headers.append('Content-Type', 'application/x-www-form-urlencoded');
headers.append('Content-Type', 'application/json');
headers.append('Access-Control-Allow-Credentials', "*");
return this._http.post(this.loginUrl, body, { headers:headers })
  .map((response: Response) => {
     //process response
  })
.catch(this.handleError);

但我仍然得到一个错误

Response to preflight request doesn't pass access control check: No
 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 
 'http://localhost:3000' is therefore not allowed access.

什么可能是错的,因为我在yii2行为中设置cors过滤器取消设置身份验证器并在以后添加它我可能会错过什么

我还检查了该链接,也这一个 ,但没有解决问题

如果CORS标头出现任何问题,我建议使用以下说明:

将cors配置添加到控制器.例如:

/**
 * List of allowed domains.
 * Note: Restriction works only for AJAX (using CORS, is not secure).
 *
 * @return array List of domains, that can access to this API
 */
public static function allowedDomains() {
    return [
        // '*',                        // star allows all domains
        'http://test1.example.com',
        'http://test2.example.com',
    ];
}

/**
 * @inheritdoc
 */
public function behaviors() {
    return array_merge(parent::behaviors(), [

        // For cross-domain AJAX request
        'corsFilter'  => [
            'class' => \yii\filters\Cors::className(),
            'cors'  => [
                // restrict access to domains:
                'Origin'                           => static::allowedDomains(),
                'Access-Control-Request-Method'    => ['POST'],
                'Access-Control-Allow-Credentials' => true,
                'Access-Control-Max-Age'           => 3600,                 // Cache (seconds)
            ],
        ],

    ]);
}

上面的代码将添加到响应特殊的http-headers.使用浏览器调试工具检查http-headers:

请求http标头应包含Origin.它将由浏览器自动添加到Crossdomain AJAX.这个http-header也可以通过你的JS库添加.没有这个http-header corsFilter将无法正常工作.

POST /api/some-method-name HTTP/1.1
Host: api.example.com
Connection: keep-alive
Content-Length: 86
Accept: */*
Origin: https://my-site.example.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Referer: https://my-site.example.com/
Accept-Encoding: gzip, deflate, br
Accept-Language: en-GB,en;q=0.8,en-US;q=0.6,ru;q=0.4

响应http标头应包含Access-Control-*标头.这个http标题将被添加corsFilter.

HTTP/1.1 200 OK
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: https://my-site.example.com
Content-Type: application/json; charset=UTF-8
Date: Fri, 24 Feb 2017 09:21:47 GMT
Server: Apache
Content-Length: 27
Connection: keep-alive

如果您没有看到这些http标头作为响应,可能意味着它\yii\filters\Cors不起作用.

检查控制器中的其他行为/过滤器.尝试添加corsFilter为第一个行为.可能一些其他行为会阻止执行corsFilter.

尝试禁用此控制器的CSRF验证(可能会阻止外部访问):

/**
 * Controller for API methods.
 */
class ApiController extends Controller
{

    /**
     * @var bool See details {@link \yii\web\Controller::$enableCsrfValidation}.
     */
    public $enableCsrfValidation = false;

    // ...
}

另外应检查您的Web服务器.可能nginx可能需要额外配置,apache可能需要重启.

Access-Control-*可以使用web-server添加响应中的标头(请参阅apache和nginx).但我不建议使用这种方式,因为在这种情况下,您无法使用应用程序管理http-haders.

一些有用的信息可以在这里找到:

Yii2:如何在非restfull API上允许CORS