下载管理器仅下载 .bin 文件

Question

I have a problem with the download manager in android. I am trying to download a .mp4 video file from a webview but no matter what I did, it always download the file with .bin extenstion. it is not related to the filename, I know because I tried both guessFileName() function and manually entering a name but the result is same. In other browsers, there is no problem downloading the content(.mp4). One issue may be about mimetype, it returns "application/octet-stream" therefore I tried request.setMimeType("video/mp4"); but still I get the mimetype unchanged.

onCreate:

DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
            String cookies = CookieManager.getInstance().getCookie(url);
            request.addRequestHeader("cookie", cookies);
            request.setMimeType(mimetype);
            request.addRequestHeader("User-Agent", userAgent);
            request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimetype));
            request.setDescription("Downloading File...");
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(url, contentDisposition, mimetype));
            request.allowScanningByMediaScanner();
            Log.i("TAG1", url);
            Log.i("TAG1", contentDisposition);
            Log.i("TAG1", mimetype);

            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

            dm.enqueue(request);

MyWebViewClient class:

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
    view.loadUrl(url);
    return true;
}

Logs:

I/TAG1: http://someurl.com/someurl
I/TAG1: attachment; filename="filename.mp4"
I/TAG1: application/octet-stream

One additional note: Downloading happens after redirecting the URL to other URL. But I have tried downloading without redirecting the URL, and still got the .bin file.

Answer 1

Removing

ForceType application/octet-stream

from .htaccess solves the issue