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bug#25735: 26.0.50; url-retrieve errors are peculiar


From: Lars Ingebrigtsen
Subject: bug#25735: 26.0.50; url-retrieve errors are peculiar
Date: Wed, 15 May 2019 09:19:10 +0200

Richard Copley <address@hidden> writes:

> No, it's the best I could come up with given the "hint":
>   "The error can be signaled with (signal ERROR-SYMBOL DATA)"
> in the url-retrieve docstring.

Oh, I misread what you wrote.

----
(:redirect REDIRECTED-TO) - the request was redirected to this URL
(:error (ERROR-SYMBOL . DATA)) - an error occurred.  The error can be
signaled with (signal ERROR-SYMBOL DATA).
----

So, yeah, that's wrong.  It should be more like

(signal ERROR-SYMBOL (format "%S" data))

I guess?  But, as you say, that's not very useful, either.  Describing
DATA would be nicer.

Here's the actual uses in url.el:

url-http.el 734:                     (nconc (list :error (list 'error 
'http-redirect-limit
url-http.el 865:               (nconc (list :error (list 'error 'http 
url-http-response-status))
url-http.el 920:               (nconc (list :error (list 'error 'http 
url-http-response-status))
url-http.el 1446:             (nconc (list :error (list 'error 
'connection-failed why
url-queue.el 127:  (when (and (eq (car status) :error)
url-queue.el 190:          (cons (list :error (list 'error 'url-queue-timeout

As we can see, the only ERROR-SYMBOL in use is `error', which makes this
even less useful, and the DATA depends on what the real error type is...

I guess we could just describe these in the doc string instead stop
talking about `signal'?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





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