Auto-checking dead links in the manual (was: http: links in the manual)

[Ihor Radchenko <yantar92@gmail.com>]

Juan Manuel Macías <maciaschain@posteo.net> writes:

>> Max Nikulin to emacs-orgmode. [PATCH] org-manual.org: Update links to
>> MathJax docs. Sun, 3 Oct 2021 23:17:46 +0700.
>> https://list.orgmode.org/sjcl3b$gsr$1@ciao.gmane.io
>>
>> In the particular case of docs.mathjax.org I am unsure if mild
>> preference of http: over https: is not a mistake in the server
>> configuration. I do not mind "https:" there, any variant is better
>> than the old broken link.
>
> Maybe, instead of repairing the links manually, we could think of some
> code that would do this work periodically, and also check the health of
> the links, running a url request on each link and returning a list of
> broken links. I don't know if it is possible to do something like that
> in Elisp, as I don't have much experience with web and link issues. I
> think there are also external tools, like Selenium Web Driver, but my
> experience with it is very limited (I use Selenium from time to time
> when I want to take a screenshot of a web page).

This is a good idea.

Selenium is probably an overkill since we should better not link JS-only
websites from the manual anyway. What we can do instead is a make target
that will use something like wget.

Patches are welcome!

-- 
Ihor Radchenko,
Org mode contributor,
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