The webview2 has the following code that sets the token in the header when the page is opened.

await webView21.EnsureCoreWebView2Async();
var request = webView21.CoreWebView2.Environment.CreateWebResourceRequest(url, "GET", Stream.Null, "");
request.Headers.SetHeader("bearer", token);
webView21.CoreWebView2.NavigateWithWebResourceRequest(request);
webView21.CoreWebView2.Navigate(url);

You need to read this token when opening the page. How to do it?

(front : Blazor WASM , back : asp.net core)