Or even buy a copy of the book! We can do anything if we throw out all our requirements! Can you explain how I'd make calls from a frontend to a PDF? I'd like

Or even buy a copy of the book! We can do anything if we throw out all our requirements! Can you explain how I'd make calls from a frontend to a PDF? I'd like to include various search terms, and then get back well-structured data. Is this something PDF's recently started supporting?