关于微信授权的GET请求和POST请求问题

来源：10-3 使用微信授权接口实现静默和授权登录

david_Zhu

2017-07-19

public function actionLogin(){
$scope = $this->get( "scope","snsapi_base" );
$appid = \Yii::$app->params['weixin']['appid'];
$redirect_uri = UrlService::buildMUrl( "/oauth/callback" );
$url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid={$appid}&redirect_uri={$redirect_uri}&response_type=code&scope={$scope}&state=#wechat_redirect";

return $this->redirect( $url );
}

public function actionCallback(){
$code = $this->get( "code","" );
if( !$code ){
return $this->goHome();
}

//通过code 获取网页授权的access_token
$appid = \Yii::$app->params['weixin']['appid'];
$sk = \Yii::$app->params['weixin']['sk'];
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$appid}&secret={$sk}&code={$code}&grant_type=authorization_code";

$ret = HttpClient::get( $url );

老师你好，在获取静默登录授权的时候，以上两端代码都是用get请求来发送，为什么要用到curl的get请求，而不用redirect方法来实现呢？对curl理解比较浅，请老师解释一下，谢谢

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