EWW debug facilities?

[Eli Zaretskii <eliz@gnu.org>]

How do you debug EWW, when it fails to do something?  Perhaps I'm
missing something, but there doesn't seem to be any debug or log
facilities in eww.el.  When something goes wrong, it's useful to see a
detailed log of the URLs EWW tried to fetch, including the results,
and perhaps also the related logs from the url*.el APIs it invokes.
That should allow finding the offending code, which can then be
debugged by traditional means.

Does something like that exist?  If not, would it be a good idea to
add them?

Thanks.