url-retrieve and encoding

[<tomas@tuxteam.de>]

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Hello, Emacs experts

I'm trying to fetch a Web resource via https with Emacs.

IIUC, url-retrieve (and its sinchronous friend) are the tools for
the job. They work nicely, but they leave me with a unibyte buffer
(confusingly, the line endings are just linefeeds: from the HTTP
specs I'd expected "\r\n")

Is there a canonical way to "make the buffer be UTF-8? (yes I know,
you know that once the "Content-Type" header line arrives, and at
that point you have read a bunch of bytes already, but the header
is supposed to be ASCII anyway).

What I've come up is to take the buffer-substring starting from
after the first empty line to the end, do a "string-as-multibyte"
with that and insert that into a fresh buffer. But that feels
a bit... gross:

(I've chosen a Greek wiktionary page because the results are more
visible):

    (defun fetch-one ()
      (let ((stuff ""))
        (with-current-buffer
            (url-retrieve-synchronously
              "https://el.wiktionary.org/wiki/μιλώντας")
          (goto-char (point-min))
          (re-search-forward "^\r?$")
          (forward-line)
          (setq stuff (buffer-substring (point) (point-max))))
        (pop-to-buffer
         (get-buffer-create "*results*"))
        (erase-buffer)
        (insert (string-as-multibyte stuff))))

What is the "right way" to do this?

Thanks for any ideas
-- 
tomás

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