无法在Android WebView中设置HttpURLConnection头

public class CustomWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        try {
            URL requestUrl = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) requestUrl.openConnection();
            connection.setRequestProperty("HeaderKey", "HeaderValue");
            
            // 执行网络请求并获取响应
            // ...
            
            // 将响应内容加载到WebView中
            // ...
            
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

<WebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

WebView webView = findViewById(R.id.webview);
webView.setWebViewClient(new CustomWebViewClient());