bug#51966: url-retrieve freeze when connecting to identity.xero.com

[Rui Yang <ryang.sei@gmail.com>]

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Hi Lars,

Thanks for looking into this.
I did the following, pls help to see if it helps.

1. Emacs from Homebrew Install Emacs using Homebrew in MacOS Big Sur.
- Install using
brew install emacs
- Got an Emacs in Terminal withou GUI
- Pasted the following

> (setq url-debug t)
>
> (defun http-handle-response (status method &optional url bufname raw
> stay-in-window)
>   "Switch to the buffer returned by `url-retreive'.
> The buffer contains the raw HTTP response sent by the server."
>   (message (format "%s" raw)))
>
> (display-buffer
>  (let* ((url "https://identity.xero.com/connect/token")
>         (method "POST"))
>    (url-retrieve url 'http-handle-response (append (list method url
> (format "*HTTP %s %s*" method url)) '())))
>  t)
>
- Got response very quickly in the buffer displayed (expected behaviour)

> (setq url-debug t)
>
> (defun http-handle-response (status method &optional url bufname raw
> stay-in-window)
>   "Switch to the buffer returned by `url-retreive'.
> The buffer contains the raw HTTP response sent by the server."
>   (message (format "%s" raw)))
>
> (display-buffer
>  (let* ((url "https://identity.xero.com/connect/token")
>         (method "POST"))
>    (url-retrieve url 'http-handle-response (append (list method url
> (format "*HTTP %s %s*" method url)) '())))
>  t)
>

2. Install Emacs from
https://emacsformacosx.com/emacs-builds/Emacs-27.2-3-universal.dmg
- start Emacs from command line with:

> /Applications/Emacs.app/Contents/MacOS/Emacs --no-init
>
- execute the above script
- I got the following:
[image: image.png]
You could see that the *http... buffer is always empty and stay like that
for some time (maybe 30s), and eventually, the mini buffer showed a nil.
[image: image.png]

Could this be an issue only for the binary from emacsformacosx?

Regards,
Rui


On Sat, Nov 20, 2021 at 8:49 PM Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Rui Yang <ryang.sei@gmail.com> writes:
>
> > Emacs -Q
> > ;; the following script hopefully will demonstrate the issue
> > ;; after evaluating the code below, url-retrieve seems started a new
> > ;; process to do the https call, that call should give a bad request
> with
> > ;; json response {"error":"invalid_client"}
> > ;; but it took a lot of time for the call back to be called
> > ;; I suspect sth special about Xero domain’s certificate which caused
> > ;; this issue. https://www.google.com.au is fine
> > ;; tried starting with emacs option, --no-init
>
> I'm unable to reproduce the issue with either Emacs 27.2 or the current
> trunk -- with your test case I just get this page:
>
> HTTP/1.1 301 Moved Permanently
> Server: AkamaiGHost
> Content-Length: 0
> Location: https://login.xero.com/identity/user/login
>
> Is there something else needed to reproduce the problem?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>

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