add_header Access-Control-Allow-Origin http://www.fq.yii.com;
add_header Access-Control-Allow-Origin http://www.d.yii.com;

Response Headers
Access-Control-Allow-Origin: http://www.fq.yii.com
Access-Control-Allow-Origin: http://www.d.yii.com
Connection: keep-alive
Content-Type: application/json; charset=UTF-8
... ...

Request Headers
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.8
Host: api.d.fanhaobai.com
Origin: http://www.fq.yii.com
Proxy-Connection: keep-alive
... ...

class BaseController extends Controller
{
  /**
   * @inheritdoc
   */
  public function behaviors()
  {
    return [
      'corsFilter' => [
        'class' => \yii\filters\Cors::className(),
        'cors' => [
          //運行cors域名列表
          'Origin' => ['http://www.d.yii.com', 'http://www.fq.yii.com'],
          'Access-Control-Allow-Credentials' => true,
        ]
      ],
    ];
  }
}

Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://www.fq.yii.com
Connection: keep-alive
Content-Type: application/json; charset=UTF-8
... ...

class Cors extends ActionFilter
{
  /**
   * @var array CORS所用的響應(yīng)頭
   */
  public $cors = [
    'Origin' => ['*'],
    'Access-Control-Request-Method' => ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS'],
    'Access-Control-Request-Headers' => ['*'],
    'Access-Control-Allow-Credentials' => null,
    'Access-Control-Max-Age' => 86400,
    'Access-Control-Expose-Headers' => [],
  ];
  
  /**
   * 執(zhí)行action前要做的事
   * @inheritdoc
   */
  public function beforeAction($action)
  {
    $this->request = $this->request ?: Yii::$app->getRequest();
    $this->response = $this->response ?: Yii::$app->getResponse();
    ... ...
    $requestCorsHeaders = $this->extractHeaders();
    //獲取cors所用的響應(yīng)頭
    $responseCorsHeaders = $this->prepareHeaders($requestCorsHeaders);
    //設(shè)置cors所用的響應(yīng)頭
    $this->addCorsHeaders($this->response, $responseCorsHeaders);
    return true;
  }
  
  /**
   * 處理cors所用的響應(yīng)頭，動態(tài)處理Access-Control-Allow-Origin域
   * @param array $requestHeaders CORS headers we have detected
   * @return array CORS headers ready to be sent
   */
  public function prepareHeaders($requestHeaders)
  {
    $responseHeaders = [];
    //$requestHeaders['Origin']為源地址，請求所在域名
    if (isset($requestHeaders['Origin'], $this->cors['Origin'])) {
      //源地址在白名單中，則設(shè)置Access-Control-Allow-Origin為源地址
      if (in_array('*', $this->cors['Origin']) || in_array($requestHeaders['Origin'], $this->cors['Origin'])) {
        $responseHeaders['Access-Control-Allow-Origin'] = $requestHeaders['Origin'];
      }
    }
    ... ...
   }
}