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Why does url-retrieve ignore url-mime-accept-string and most other url v
From: |
Clément Pit--Claudel |
Subject: |
Why does url-retrieve ignore url-mime-accept-string and most other url variables? |
Date: |
Tue, 29 Mar 2016 11:52:49 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 |
The doc string of url-retrieve says:
> The variables ‘url-request-data’, ‘url-request-method’ and
> ‘url-request-extra-headers’ can be dynamically bound around the
> request; dynamic binding of other variables doesn’t necessarily
> take effect.
What's the proper way, then, to set ‘url-mime-encoding-string’,
‘url-mime-charset-string’, and ‘url-mime-accept-string’ for a single query? In
particular, how come things work with ‘url-retrieve-synchronously’, but not
with ‘url-retrieve’?
More precisely: this sends a query with ‘Accept: */*’, and prints nil:
(let ((url-mime-accept-string "abc/def"))
(url-retrieve "http://www.gnu.org/software/emacs/"
(lambda (&rest _)
(message "url-retrieve: %S"
url-mime-accept-string))))
but this sends a query with ‘Accept: abc/def’, and prints “abc/def”:
(let ((url-mime-accept-string "abc/def"))
(with-current-buffer
(url-retrieve-synchronously
"http://www.gnu.org/software/emacs/")
(message "url-retrieve: %S"
url-mime-accept-string)))
Is that a bug? If not, could we document the proper way to set an Accept header?
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