微信小程序request获取重定向链接

wx.request({
        url: '',
        method:'get',
        header: {
          'content-type': 'application/x-www-form-urlencoded',
        }
      }).onHeadersReceived(res => {
        console.log(res)
        if (res.header.Location) {
          resolve(res.header.Location)
        }
})

通过onHeadersReceived可以获取到请求链接重定向的链接信息，自测只有在安卓手机上有效，在苹果和pc无效。

一般通过后台获取，如php的获取后传回前端

function get_redirect_url($url, $referer="", $timeout = 10) {
    $redirect_url = false;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, TRUE);
    curl_setopt($ch, CURLOPT_NOBODY, TRUE);//不返回请求体内容
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);//允许请求的链接跳转
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    "toolName"=> "B站封面下载",
    "Accept" => "*/*",
    "User-Agent" => "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)",
    "Connection" => "Keep-Alive"));
    if ($referer) {
    curl_setopt($ch, CURLOPT_REFERER, $referer);//设置referer
    }
    
    $content = curl_exec($ch);
    if(!curl_errno($ch)) {
    $redirect_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);//获取最终请求的url地址
    }
    
    return $redirect_url;
}