bug#58925: 29.0.50; url-open-stream has no option pass tls options per call

[Robert Pluim]

>>>>> On Mon, 31 Oct 2022 13:35:16 +0200, Björn Bidar via "Bug reports for GNU 
>>>>> Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> said:

    Björn> While investigating who to use magit with tls client certificates
    Björn> I noticed that url-open-stream has no option to pass options to
    Björn> network-open-stream on a per connection basis to do thing like e.g.
    Björn> request the use of tls client certificates.

    Björn> If this was possible the client could be able to call url with 
something
    Björn> like (url-http "https://example.com"; 'my-cb gw-options) to pass more
    Björn> options to the specific gateway that is used.

    Björn> I know it is possible to use network-stream-use-client-certificates
    Björn> however that might be not always as elegant to use.

Elegance is in the eye of the beholder :-)
`network-stream-use-client-certificates' lets you configure which
client certificate is used for a host via auth-source. What other
options did you have in mind?

Robert
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