Yii2 cors filters error that No 'Access-Control-Allow-Origin' header is present

问题

Following This question i have set my rest controller behaviour as

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']);

And now the cors filters

    // 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;
}

An my angular2 frontend as

    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);

But am still getting an error of

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.

What could be wrong since ive set the cors filter in yii2 behaviours unset authenticator and added it later What could i be missing out

I have also checked on This link and also this one but none solves the issue

回答1:

In case of any problems with CORS headers, I recommend to use following instruction:

Add cors configuration to your controller. For instance:

/**
 * 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)
            ],
        ],

    ]);
}

The above code will add to response special http-headers. Check http-headers using browser debug tools:

Request http header should contain Origin. It will be added by browser automatically at Crossdomain AJAX. This http-header can be added also via your JS library. Without this http-header corsFilter won't work.

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

Response http headers should contain Access-Control-* headers. This http-header will be added by 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

If you don't see these http headers in response, probably it means that \yii\filters\Cors doesn't work.
Check other behaviors/filters in controller. Try add corsFilter as first behavior. Probably some other behaviors prevents execution of corsFilter.

Try to disable CSRF validation for this controller (it may prevent external access):

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

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

    // ...
}

Additionally should be checked your web-server. Probably nginx may require additional configuration, apache can require restarting.
Access-Control-* headers in response can be added using web-server (see for apache and nginx). But I don't recommend to use this way, because in this case you can't manage http-haders using application.
Some useful information can be found here:
- Yii2: How to allow CORS on non-restfull API

回答2:

Try This :

public static function allowedDomains()
{
    return [
        // '*',                        // star allows all domains
        'http://localhost:3000',
        'http://test2.example.com',
    ];
}  



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)

                ],
            ],

        ]);
    }

Add This Function on your controller .

And One Thing angular2 use OPTION method at the first time For so allow OPTION method also

回答3:

The problem arises when the frontend runs in a port other than the default port (80).

Then in yii you need to specify the port to work. Example: frontend runs at http: // localhost: 3000 in Yii cors set:

'Origin' => ['http: // localhost: 3000']

If you do not specify the port (3000), Yii interprets the port by default and the result is:

'Origin' => ['http: // localhost: 80']

来源：https://stackoverflow.com/questions/41647444/yii2-cors-filters-error-that-no-access-control-allow-origin-header-is-present

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