bug#17959: support accessing FTP services via HTTP proxies

[Ivan Shmakov]

>>>>> Ivan Shmakov <ivan@siamics.net> writes:

[…]

 > Thus, my suggestion would be to:

 > • allow the caller of the url*.el facilities to explicitly state
 > whether it’s interested in a document to be returned, in some code to
 > be called, or either;

[…]

 > I guess all of the above warrant separate bug reports, which I
 > hope to file shortly.

        Filed #19822 for the first point.  Once it’s decided how to fix
        that (and if), changes for url-file, url-irc, url-news, etc.,
        wouldn’t be all that a big deal.

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