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At most sites I visit, the PDF file does open in the browser. However, not at the Nautis project.
I think Ackbarr has a solution in his post.
If one changes
content-disposition: attachment;
to
content-disposition: inline;
by editing the lines of code he points to, I suspect that would "fix" it. On the other hand, if you prefer that it is downloaded instead of viewed in the browser, then it isn't broken.
Just depends what your preference is.
I love your site, by the way.