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bug#16960: 24.3.50; Infinite loop in url-retrieve-synchronously if metho

From: Alex Kost
Subject: bug#16960: 24.3.50; Infinite loop in url-retrieve-synchronously if method is POST and response status is 301/302
Date: Fri, 07 Mar 2014 19:25:30 +0400

The problem is the following: when I try to login to
https://aur.archlinux.org with `url-retrieve-synchronously' (see the
code below), Emacs freezes (C-g helps) because callback passed to
`url-retrieve' is never called.

AFAIU this happens because `url-http-parse-headers' returns nil if
response status is 301/302/307 and method is not "HEAD" or "GET" (see
At least the problem goes away when I add:

  (setq success t)


  (or `moved-permanently `found `temporary-redirect)

in `url-http-parse-headers'.

Would it be OK to allow such requests?

Recipe is simple but you need to have an account on
<https://aur.archlinux.org> for that:

1. emacs -Q
2. Evaluate (setq url-debug t)
3. Evaluate the following code:

Attachment: binsRHNYk3NqH.bin
Description: application/emacs-lisp

3. Emacs hangs; press C-g
4. In "*URL-DEBUG*" buffer you can see the line:

  http -> Finished parsing HTTP headers: nil

In GNU Emacs (i686-pc-linux-gnu, GTK+ Version 3.10.6)
 of 2014-02-02 on leviafan
Windowing system distributor `The X.Org Foundation', version 11.0.11500000
Configured using:
 `configure --prefix=/home/alexx/usr'

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