Firefox ignores Response.ContentType

.net, asp.net, c#, httpwebrequest

Solution

Try adding a `Response.ClearHeaders()` before calling `ClearContents()` like x2 mentioned and sending the file as `application/octet-stream`:

Response.ClearHeaders();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=\"blah\""); 
...

Works for me when I need to transmit downloadable files (not necessarily mp3s) to the client.

Problem

I have the following code that's essentially "proxying" a file from one server to another. It works perfectly in IE, but Firefox seems to ignore the `Content-Type` header and always transmits the files (MP3s) as `text/html`. It's not a major issue, but I'd like to get it working correctly in all browsers, so can anyone assist? Also, if there is a better/more efficient way of accomplishing this, please post it! ``` FileInfo audioFileInfo = new FileInfo(audioFile); HttpWebRequest downloadRequest = (HttpWebRequest) WebRequest.Create(audioFile); byte[] fileBytes; using (HttpWebResponse remoteResponse = (HttpWebResponse) downloadRequest.GetResponse()) { using (BufferedStream responseStream = new BufferedStream(remoteResponse.GetResponseStream())) { fileBytes = new byte[remoteResponse.ContentLength]; responseStream.Read(fileBytes, 0, fileBytes.Length); Response.ClearContent(); // firefox seems to ignore this... Response.ContentType = Utilities.GetContentType(audioFileInfo); // ... and this //Response.ContentType = remoteResponse.ContentType; Response.AddHeader("Content-Disposition", string.Format("attachment; filename=\"{0}\"", audioFileInfo.Name)); Response.AddHeader("Content-Length", remoteResponse.ContentLength.ToString()); Response.BinaryWrite(fileBytes); Response.End(); } } ```

Original source