Question

There is a desktop browser called ‘360 secure browser‘. They have a fairly large share of the market in China, and we are required to support them.

It says the layout engine is Trident (IE), which is what I expected, but I can’t verify that right now (on a mac!).

The reason for this is that I have some forms that kick off a download, streaming bytes to the client, and they work in the other major browsers. The code that causes the issue is below, or similar. Is this doing something wrong that I don’t notice? The byte streams are usually on the order of 50-100KB, and we haven’t had issues with it yet.

• This code is called in response to a PostBack event (eg, button click in a grid, etc)
• This function is called with bytestreams from files, generated in memory, or read from db.

The function:

public static bool DownloadStream(byte[] packageStream, string fileName) {
    var response = HttpContext.Current.Response;
    response.Clear();
    response.AddHeader("Accept-Ranges", "bytes");
    response.AddHeader("Content-Disposition", "inline; filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));
    response.AddHeader("Content-Length", packageStream.Length.ToString());
    response.ContentType = "application/xlsx";
    response.BinaryWrite(packageStream);
    response.Flush();
    HttpContext.Current.ApplicationInstance.CompleteRequest();
    return true;
}

Does anyone have any experience supporting this browser? I can’t find any information on it when searching in english on google. No specs, no docs, nothing. I have to go to Baidu to find info, and I can’t read that level of chinese!

EDIT:

The issue is with the downloader that 360 uses, apparently. I would like to know if there is something that should be changed in the streaming code, though. A header that I am missing, or something else.

• This is only happening for small files. Same page, bigger download = no issues.
• Changing to the built-in IE downloader causes the issue to go away.

Answer 1

Hi i tried your code on 360 secure browser. it work for me. and i edit a little bit below is my code.
Note: As i know, 360 secure browser is using IE Core.

   protected void Page_Load(object sender, EventArgs e)
    {
        DownloadStream(StreamFile(@"C:\Users\My\Desktop\test2.xlsx"), "test.xlsx");
    }

    private byte[] StreamFile(string filename)
    {
        FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);

        // Create a byte array of file stream length
        byte[] Data = new byte[fs.Length];

        //Read block of bytes from stream into the byte array
        fs.Read(Data, 0, System.Convert.ToInt32(fs.Length));

        //Close the File Stream
        fs.Close();
        return Data; //return the byte data
    }


    public static bool DownloadStream(byte[] packageStream, string fileName)
    {
        var response = HttpContext.Current.Response;
        response.ClearContent();
        response.ClearHeaders();
        response.AppendHeader("Accept-Ranges", "bytes");
        response.AppendHeader("Content-Disposition", "inline; filename=" + HttpUtility.UrlEncode(fileName, Encoding.UTF8));
        response.AppendHeader("Content-Length", packageStream.Length.ToString());
        response.ContentType = "application/xlsx";
        response.BinaryWrite(packageStream);
        response.Flush();
        response.End();
        return true;
    }