How to add Headers in HTTPContext Response in ASP.NET MVC 3?

Question

I have a download link in my page, to a file I generate by the user request. Now I want to display the file size, so the browser can display how much is left to download. As a solution, I guess addin a Header to the request would work, but now I don't know how to do it.

Here is my try code:

public FileStreamResult DownloadSignalRecord(long id, long powerPlantID, long generatingUnitID)
{
    SignalRepository sr = new SignalRepository();
    var file = sr.GetRecordFile(powerPlantID, generatingUnitID, id);
    Stream stream = new MemoryStream(file);

    HttpContext.Response.AddHeader("Content-Length", file.Length.ToString());

    return File(stream, "binary/RFX", sr.GetRecordName(powerPlantID, generatingUnitID, id) + ".rfx");
}

When I checked on fiddler, it didn't display the Content-Length header. Can you guys help me out?

CGK · Accepted Answer · 2019-09-04 06:03:34Z

25

Try using

HttpContext.Response.Headers.Add("Content-Length", file.Length.ToString());

edited Sep 4, 2019 at 6:03

CGK

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answered Jun 30, 2011 at 23:22

winy101

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Comments

Mrchief · Accepted Answer · 2011-06-30 18:34:00Z

18

Try HttpContext.Current.Response.AppendHeader("Content-Length", contentLength);

answered Jun 30, 2011 at 18:34

Mrchief

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2 Comments

Bruno Machado - vargero Over a year ago

The Current doesn't exist inside HttpContext.

Mrchief Over a year ago

OK, then leave out Current. Just use AppendHeader instead of AddHeader in your original code.

Mikael Östberg · Accepted Answer · 2011-06-30 18:39:51Z

4

Can you please try the following code and see if that works?

public FileStreamResult Index()
{
    HttpContext.Response.AddHeader("test", "val");
    var file = System.IO.File.Open(Server.MapPath("~/Web.config"), FileMode.Open);
    HttpContext.Response.AddHeader("Content-Length", file.Length.ToString());
    return File(file, "text", "Web.config");
}

"It works on my machine"

And I've tried without the Content-length header and Fiddler reports a content length header anyway. I don't think it's needed.

answered Jun 30, 2011 at 18:39

Mikael Östberg

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2 Comments

Bruno Machado - vargero Over a year ago

Your example worked, but when I generate my file, it doesn't happen. ;/

Mikael Östberg Over a year ago

Have you checked that the stream actually contains anything? sr.GetRecordFile(..) returns a byte[], right?

Mikael Östberg · Accepted Answer · 2011-06-30 19:02:03Z

1

This should solve it as I think there's no need to use the FileStreamResult, when you can use the byte[] directly.

public FileContentResult DownloadSignalRecord(long id, long powerPlantID, long generatingUnitID)
{
    SignalRepository sr = new SignalRepository();
    var file = sr.GetRecordFile(powerPlantID, generatingUnitID, id);

    HttpContext.Response.AddHeader("Content-Length", file.Length.ToString());

    return File(file, "binary/RFX", sr.GetRecordName(powerPlantID, generatingUnitID, id) + ".rfx");
}

Note the FileContentResult return type.

answered Jun 30, 2011 at 19:02

Mikael Östberg

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Comments

heisenberg · Accepted Answer · 2011-06-30 18:36:36Z

0

Not sure what else may be wrong there, but that content-length should be the size of the binary, not the string length.

answered Jun 30, 2011 at 18:36

heisenberg

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1 Comment

Mikael Östberg Over a year ago

Actually the length there should be the length of the stream, which would be the length of the binary, right?

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