HttpResponseMessage.Content.Headers ContentDisposition is null

Question

When downloading a file with HttpClient, I\'m downloading first the headers and then the content. When headers are downloaded, I can see Headers collection on the Content pr

Answer 1

The problem is with the trailing ; in the content-disposition header

        [Fact]
        public void ParseContentDispositionHeader()
        {
            var value = ContentDispositionHeaderValue.Parse("attachment; filename=GeoIP2-City_20140107.tar.gz");
            Assert.Equal("GeoIP2-City_20140107.tar.gz",value.FileName);
        }

If I add the semi-colon the parsing will fail. If you look at the RFC6266 grammar, the semi-colon is only supposed to precede the parameter.

Answer 2

Thank you - finding this definitely helped me. For the benefit of others, here is my workaround (as apparently this is still a thing today???)

I am in a somewhat controlled environment, so the following code assumes:

• Only one Content-Disposition Header
• The tag is in the format: inline; "filename";

This will reset the response's ContentDisposition header, so subsequent code works seamlessly:

<!-- language: c# -->
if (response.Content.Headers.ContentDisposition == null)
{
  IEnumerable<string> contentDisposition;
  if (response.Content.Headers.TryGetValues("Content-Disposition", out contentDisposition))
  {
   response.Content.Headers.ContentDisposition = ContentDispositionHeaderValue.Parse(contentDisposition.ToArray()[0].TrimEnd(';').Replace("\"",""));
  }
}