pdfXBlock uses http protocol for its default pdf url, which block this pdf to be viewed at https sites
default="http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf" at
https://github.com/MarCnu/pdfXBlock/blob/master/pdf/pdf.py#L26
We have to disable the protection to view this pdf
Screenshot when https protection is enabled

pdfXBlock uses http protocol for its default pdf url, which block this pdf to be viewed at https sites
default="http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf" at
https://github.com/MarCnu/pdfXBlock/blob/master/pdf/pdf.py#L26
We have to disable the protection to view this pdf
Screenshot when https protection is enabled
