Unicode in Content-Disposition header

Question

I am using HttpContext object implemented in HttpHandler child to download a file, when I have non-ascii characters in file name it looks weird in IE whereas it looks fine i

Answer 1

For me this solved the problem:

var result = new HttpResponseMessage(HttpStatusCode.OK)
{
   Content = new ByteArrayContent(data)
};

result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileNameStar = "foo-ä-€.html"
};

When i look ad the repsonse in fiddler i can see the filename has automaticcaly been encoded using UTF-8:

Fiddler response example with encoded Content-Disposition filename using UTF-8

If we look at the value of the Content-Disposition header we can see it will be the same as @Johannes Geyer his answer. The only difference is that we didn't have to do the encoding ourselfs, the ContentDispositionHeaderValue class takes care of that.

I used the Testcases for the Content-Disposition header on: http://greenbytes.de/tech/tc2231/ as mentioned by Julian Reschke. Information about the ContentDispositionHeaderValue class can be found on MSDN.