MVC 5 Content Disposition errors in Chrome and Firefox - google-chrome

Question

I would like to display the user manual of the system as pdf in the browser.
The following code works fine in IE9 but not
Chrome - Error duplicate errors received from server
Firefox - Corrupted content error
The MVC 5 code ( I think is adding duplicate headers which IE can handle)
Just wondering is there any way this will work with all browsers?
public FileResult UserManual()
{
var FileName = "user-manual.pdf";
var cd = new ContentDisposition
{
Inline = true,
FileName = FileName
};
Response.AddHeader("Content-Disposition", cd.ToString());
string path = AppDomain.CurrentDomain.BaseDirectory + "App_Data/";
return File(path + FileName, MediaTypeNames.Application.Pdf, FileName);
}

Answer 1

I know this is old but I got into the same issue today.
If you add a "Content-Disposition" header then do not return File with the "FileName" argument added
Check this:
if (myFile.IsInlineContent()) // Evaluate the content type to check if the file can be shown in the browser
{
Response.AppendHeader("content-disposition", $"inline; myFile.Filename}");
return File(myFile.Path, myFile.Type); // return without filename argument
}
// if not, treat it as a regular download
return File(myFile.Path, myFile.Type, myFile.Filename); // return with filename argument
Hope this helps...

Answer 2

In order to show the file in the browser, do not provide the file name as the third parameter to the File method in your return statement. This forces a content-disposition of attachment behind the scenes. As such, your code should result in an invalid response with an ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION error.