Capture the error messages #3
Description
For analysis and bug hunts, we need the messages to know if it's something our side or to just catch trends in external server implementations to update the link checker.
I would note also that we need to handle exceptions related to the request (encoded as 900s in the initial analysis) for the same - so not an HTTP status response but a code exception that relates to some issue with the requests (timeouts, some SSL cert problem, etc).