The structure below is

• url of page with broken link
  • url of the broken link
    • error message

• https://access.redhat.com/documentation/en-us/red_hat_amq/7.3/html-single/using_the_amq_python_client/
  • http://qpid.apache.org/releases/qpid-proton-0.28.0/proton/python/api/proton.handlers.MessagingHandler-class.html
    • 404

The problem seems to be that classes in the upstream docs moved under _handlers module, as in https://qpid.apache.org/releases/qpid-proton-0.28.0/proton/python/api/proton._handlers.MessagingHandler-class.html