Don't have to, but if the PDF side is not used for direct viewing, then it's going to return the PDF data no matter what. It seems the viewing is done on the cURL side of things as opposed to the PDF side of things. So if that's the case then it's not a requisite that you set the content type on there, only on the page where the PDF is getting interpreted as a PDF.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.