I start the content server in Calibre and get the url and port number.
I can go to another PC and using Chrome or IE enter the url

ort and my libraries appear and I can choose one to see and download the books
I can also connect using the safari browser on a newer (IOS 14.2)
I do the same on my ole (IOS 9.3.5) iPad using Safari or Chrome and get an error message stating that I am
"Attempting to assign a read only property"
When I dismiss that error I'm told that I have a
"NoFoundError: DOM IDBDatabase Exception 8: An operation failed because thee requested database could not be found."
Is there a problem with older iPads or am I overlooking a setting?