Question

Im trying to open pdf files or other files types like images with the browser but ff and chrome are giving the duplicate content error. I am using the code below to open the files.

Response.Contentype = file.ContentType;
Response.AppendHeader("Content-Disposition",string.Format("inline;filename=\"{0}\"",file.Filename));
return File(file.Data,file.ContentType,file.FileName);

Answer 1

Remove the first 2 lines of your code. They are not needed. The return File(file.Data, file.ContentType, file.FileName); method already already adds a ContentType (because of the second argument) and Content-Disposition header to attachment (because of the third argument).

If you don’t want set the Content-Disposition header to attachment but inline then remove the third argument:

return File(file.Data, file.ContentType);