Add support for configuring a front and back cover page for PDFs #4
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Because Puppeteer doesn't allow for the header/footer to be configured 'per page' on a programatic basis, instead we'll try overcome this by allowing the response PDF to have a specified page (or pages) added to the front and back.
The specified path will be requested via the middleware (to the downstream app) using the same request method/body as the original request, but will override the path/params with those specified in the
front_cover_path
andback_cover_path
parameters.These parameters can be configured in the global options or via meta tags in the original downstream response.