I am outputting a PDF file in a Web browser (IE8) HttpContext.Response.writefile(fileName) and it works great. When I try to save the file, it will give me the name of the ashx handler as a default. I would like to actually pass the real name.
I tried to add header information as follow:
context.Response.AddHeader("content-disposition", "attachment; filename=" + fileInfo.Name);
And it works but I do not want the user to have to choose between open and save, i want the file to open normally and if the user chooses to save it then the dialog would give him/her the default filename.
I tried also:
context.Response.AddHeader("content-disposition", "inline; filename=" + fileInfo.Name);
Or just, like Scott Hanselman suggested in his blog.
context.Response.AddHeader("content-disposition", "filename=" + fileInfo.Name);
None of those work for me. Does anybody have any ideas?
See test cases at http://greenbytes.de/tech/tc2231/#inlwithasciifilenamepdf - it seems that this is simply a missing feature in IE.
I also came across this problem.
What helped me was to also set the contenttype to application/pdf (instead of application/x-pdf, which is outdated)
response.setContentType("application/pdf");
response.setHeader("Content-disposition", "inline; filename=\"Report.pdf\"");
In case of INLINE, it seems that Internet explorer is using the last parameter in the URL to build the filename. For example if your url is http://doc.com/131231231 IE will prompt you to save the file as 131231231.pdf If you need a filename for example foo_131231231.pdf you can hack the IE by using this url: http://doc.com/foo_131231231 You may suffer to change your app a bit to expect such ugly parameter, but at the end your app will work as you expect.
来源：https://stackoverflow.com/questions/14818732/pdf-handler-content-disposition-filename