I need to view and PDF file stored as an attachment inside an IFRAME in this context: Visualforce: Why the display of an PDF-File inside an IFRAME works on a Sandbox but not in Production?

Inspecting the Request-Header Details the server responds differently, but I can't understand why. Now I was able to nail down the exact difference, which is a different Content-Disposition header. I need it to be inline. On Sandbox I get Inline as desired but on Production I got Attachment which is very bad for what I want.

Here are the links:



gets rewritten to


The response header becomes

Content-Disposition inline; filename="FILENAME.pdf"



it does not get rewritten

and the response header becomes

Content-Disposition attachment; filename="FILENAME.pdf"


Anyone knows how this can be tweaked to take control and get always the header to be either Inline or Attachment as needed?

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