问题
I'm using Winnovative PDF Converter to generate PDF files from HTML (URL)
When triggering a button on a HTTP web page, to generate a PDF from a HTTP URL, this works fine.
However when triggering a button on a HTTPS web page, to generate a PDF from a HTTP URL, I get the error:
Could not render the url. Could not get image from url.Navigation timeout..
Why is this happening and how can I prevent it?
Please Note: I'm not getting an error when generating a PDF of a HTTPS page, I'm getting an error when making a web request from a HTTPS page to generate a PDF
来源：https://stackoverflow.com/questions/7673544/generating-pdf-from-https-causes-error