Xamarin.Forms Webview中未发送自定义请求标头

如何解决Xamarin.Forms Webview中未发送自定义请求标头

是否有人试图将身份验证标头“注入”到表单或本机WebView中？有一个好的解决方案吗？

我们需要从Forms应用程序内向网页发出GET请求，并且必须在Authentication标头中发送访问令牌。 我已经实现了自定义WebViewRenderers（适用于iOS和Android），在其中重写了OnElementChanged方法，代码运行无误，但标头未随请求发送。它不适用于Android或iOS。

这是我当前对WebViewRenderers的实现：

namespace MyNamespace.Droid.Renderers
{
    public class HybridWebViewRenderer : WebViewRenderer
    {
        public HybridWebViewRenderer(Context context) : base(context){}

        protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
        {
            base.OnElementChanged(e);
            var webView = e.NewElement as HybridWebView;
            var token = "dummytoken";
            IDictionary<string,string> headers = new Dictionary<string,string>
            {
                {"Authorization","Bearer " + token }
            };
            string url = ((UrlWebViewSource)webView.Source).Url;

            Control.LoadUrl(url,headers);
        }```


```[assembly: ExportRenderer(typeof(HybridWebView),typeof(HybridWebViewRenderer))]
namespace MyNamespace.iOS.Renderers
{
    public class HybridWebViewRenderer : WkWebViewRenderer
    {
        public static void Initialize()
        { }

        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);
            var webView = e.NewElement as HybridWebView;
            var url = ((UrlWebViewSource)webView.Source).Url;
            var newRequest = new NSMutableUrlRequest();
            var token = "dummytoken";
            NSMutableDictionary dic = new NSMutableDictionary();
            dic.Add(new NSString("Authorization"),new NSString("Bearer " + token));
            newRequest.Headers = dic;
            newRequest.Url = new NSUrl(url);

            LoadRequest(newRequest);
        }```

For Android I already tried the WebViewClient approach also,without success. (from here https://forums.xamarin.com/discussion/87944/custom-header-in-webview)

Any ideas?