bug#38713: 27.0.50; eww doesn't handle protocols other than https?

[Eli Zaretskii <eliz@gnu.org>]

> From: Juri Linkov <juri@linkov.net>
> Date: Tue, 24 Dec 2019 01:12:15 +0200
> Cc: 38713@debbugs.gnu.org
> 
> >> 1. M-x eww RET about:protocols RET hangs with the following line:
> >>
> >> Loading http://about:protocols/...
> >>
> >> whereas after applying the following patch it displays the nicely
> >> formatted HTML page:
> >>
> >>   Supported Protocols - URL vEmacs
> >>    Protocol   Properties   Description
> >>    about   Synchronous  N/A
> >>      Default Port: 0
> >>    ...
> >
> > I'm not sure that makes much sense, really.  Emacs has other ways of
> > documenting these things other than putting them in an about:
> > pseudo-protocol thing.  (While other browsers do not.)
> 
> This is part of the planned bigger effort - browsers already support
> the 'about' URI scheme, but Emacs is still lagging behind.  I'd like
> to expend lisp/url/url-about.el to give information on Emacs internals
> including about:memory, about:buffers, about:processes, about:timers and
> many more, using HTML instead of semi-obsolete Info or other ad-hoc formats.
> 
> Do you think this is worth the effort?

Can you tell more about the plan?  For example, the following
questions seem to be pertinent:

 . why implement this as part of eww? Emacs is not a browser, which
   can only react to protocols, it has other ways of interaction

 . where will all the HTML content come from? will it be taken from
   the existing documentation or written from scratch?

 . eww is not very sophisticated browser, so are you sure displaying
   HTML with it will be significantly better than "semi-obsolete"
   Info?

 . more generally, what will be the advantages of providing
   documentation this way, as opposed to the way we provide it now?

Thanks.