Posted By: friedo
When working with PDFs, I’ve run across the MIME types
application/x-pdf among others.
Is there a difference between these two types, and if so what is it? Is one preferred over the other?
I’m working on a web app which must deliver huge amounts of PDFs and I want to do it the correct way, if there is one.
MIME types are controlled by a standards body, The Internet Assigned Numbers Authority (IANA). This is the same organization that manages the root name servers and the IP address space.
The use of
x-pdf predates the standardization of the MIME type for PDF. MIME types in the
x- namespace are considered experimental, just as those in the
vnd. namespace are considered vendor-specific.
x-pdf might be used for compatibility with old software.