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Asked: 2026-05-10T18:52:21+00:00

I am using ASP.NET to transmit a .jar file. This code works perfectly on

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I am using ASP.NET to transmit a .jar file. This code works perfectly on IE. However on Firefox the file downloads, corrupt. What is the best way to fix it? Below is the code I am using.

private void TransferFile() {     try     {         string filePath = Server.MapPath('SomeJarFIle.jar');          FileInfo file = new FileInfo(filePath);          if (file.Exists)         {             // Clear the content of the response             //Response.ClearContent();             Response.Clear();              // LINE1: Add the file name and attachment, which will force the open/cance/save dialog to show, to the header             Response.AddHeader('Content-Disposition', 'attachment; filename=' + file.Name);              // Add the file size into the response header             Response.AddHeader('Content-Length', file.Length.ToString());              // Set the ContentType             Response.ContentType = ReturnExtension(file.Extension.ToLower());              // Write the file into the response             //Response.TransmitFile(file.FullName);             Response.WriteFile(file.FullName);              // End the response             Response.End();         }         else         {             this.Response.Write('Error in finding file.  Please try again.');             this.Response.Flush();         }     }     catch (Exception ex)     {         this.Response.Write(string.Format('Error: {0}', ex.Message));     } }    private string ReturnExtension(string fileExtension) {     switch (fileExtension)     {         case '.htm':         case '.html':         case '.log':             return 'text/HTML';         case '.txt':             return 'text/plain';         case '.doc':             return 'application/ms-word';         case '.tiff':         case '.tif':             return 'image/tiff';         case '.asf':             return 'video/x-ms-asf';         case '.avi':             return 'video/avi';         case '.zip':             return 'application/zip';         case '.xls':         case '.csv':             return 'application/vnd.ms-excel';         case '.gif':             return 'image/gif';         case '.jpg':         case 'jpeg':             return 'image/jpeg';         case '.bmp':             return 'image/bmp';         case '.wav':             return 'audio/wav';         case '.mp3':             return 'audio/mpeg3';         case '.mpg':         case 'mpeg':             return 'video/mpeg';         case '.rtf':             return 'application/rtf';         case '.asp':             return 'text/asp';         case '.pdf':             return 'application/pdf';         case '.fdf':             return 'application/vnd.fdf';         case '.ppt':             return 'application/mspowerpoint';         case '.dwg':             return 'image/vnd.dwg';         case '.msg':             return 'application/msoutlook';         case '.xml':         case '.sdxl':             return 'application/xml';         case '.xdp':             return 'application/vnd.adobe.xdp+xml';         case '.jar':             return 'application/java-archive';         default:             return 'application/octet-stream';     } }

UPDATE:

I added the type 

case '.jar':     return 'application/java-archive';

And that did not fix the problem. If I zipped up the .jar file it was able to be transmitted fine.

I did notice when I tested againist my localhost the file was downloaded with no issues. However when I push it up to the web server is when I get the problem.

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1 Answer

  1. I don’t see a case for ‘.jar’ in the ReturnExtension() function (which I think might be better off named ‘ReturnMimetype’). Could that be the problem, or did you just forget to paste it in?

    The mimetype for .jar is supposed to be application/java-archive. Details here: http://en.wikipedia.org/wiki/Jar-file

    I think this is the issue. I remember having the same type of problem when I transmitted a .docx file (which is actually a zip file with a different extension, as a .jar files). The download worked fine in IE, but Firefox corrupted it. The solution was to send the correct mimetype.

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