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Hi Brandon, This is a great question, and one I too cannot find a straight answer for either. I found that article you reference as well, and wasn't able to find the enable option either. If I had to guess, I'd say no - they don't know how to handle it. My site was recently changed to integrate an AJAX based search product at our category page level. The url structures and server responses are designed to Google's standards regarding AJAX crawl ability, but our rankings on these category pages have basically disappeared in Bing/Hoo. The underlying HTML is full of crawlable links as well to compensate. Hopefully someone chimes in with an answer.

Yeah, I'm honestly not 100% sure on the HTTP header version, but I'd bet they don't support it. It won't hurt to try it, though, and you'd at least cover Google - I think it's probably a good best practice for PDFs that have HTML equivalents.