Unable to catch blob download

[stefanchiriac]

I'm trying to catch blob url downloads to handle them manually since android is not supporting them and crashes the app, but I can't find a way to do it.
onShouldStartLoadWithRequest seems like is being triggered only when the react app loads, but after that no longer triggers.
The code below just prints http://10.0.2.2:9000/, but never blob

 const onShouldStartLoadWithRequest = (navigator: any) => {
    const {url} = navigator;
    console.log(url);
    if (url.includes('blob:')) {
      console.log('blob');
      webview.stopLoading();
      return false;
    }
    return true;
  };

  return (
    <WebView
      ref={(ref: any) => setWebView(ref)}
      originWhitelist={['*']}
      source={{uri: 'http://10.0.2.2:9000/'}}
      style={{}}
      allowFileAccess={true}
      allowFileAccessFromFileURLs={true}
      allowUniversalAccessFromFileURLs={true}
      javaScriptEnabled={true}
      domStorageEnabled={true}
      mixedContentMode={'always'}
      onFileDownload={onShouldStartLoadWithRequest}
      onShouldStartLoadWithRequest={onShouldStartLoadWithRequest}
      onNavigationStateChange={onShouldStartLoadWithRequest}
    />
  );

Environment:

• OS: Android Embeded api 29
• react-native version: 0.63.3
• react-native-webview version: 11.0.2

[worstpractice]

I don't know about handling blob URLs on Android, but in order to (at the very least) not crash when navigating to blob URLs, I used the following snippet in the past:

const SimplifiedExample = () => {
  const webViewRef = useRef<WebView>(null);

  const handleNavigationStateChange = ({ url }: WebViewNavigation) => {
    if (!url) return;

    if (url.startsWith("blob")) {
      webViewRef.current?.stopLoading();
      console.log("Prevented blob url from loading");
    }
  };

  return (
  <WebView
    allowFileAccess
    allowFileAccessFromFileURLs
    allowUniversalAccessFromFileURLs
    onNavigationStateChange={handleNavigationStateChange}
    ref={webViewRef}
  />
  );
};

If it still crashes, I seem to recall that not showing a loading spinner/rendering an error screen helped.

Hope this helps.

[stefanchiriac]

Is still crashing with your code, even without loading spinner. But thanks anyway for the solution.

For now I'm just using #1817