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bug#10478: 24.0.50; url-http-parse-headers can silently drop the respons

From: Jerry Asher
Subject: bug#10478: 24.0.50; url-http-parse-headers can silently drop the response when handling BASIC AUTHENTICATION
Date: Wed, 11 Jan 2012 00:03:06 -0700

From: Jerry Asher <address@hidden>
To: address@hidden
Subject: 24.0.50; url-http-parse-headers can silently drop the
response when handling BASIC AUTHENTICATION
Date: Tue, 10 Jan 2012 23:59:59 -0700
Message-ID: <address@hidden>
--text follows this line--
I am developing an interface to posterous.com.  Posterous has a restful
api described at posterous.com/api.

They require basic authentication.

When making a GET request again their simplest api, users/me that
returns information about the logged in user, url-retrieve-synchronously
will return the wrong buffer.

This seems to be traceable to url-http-parse-headers handling the "401
Basic: Access denied message by" calling url-http-handle-authentication
which prompts the user for a name and password and calls
url-retrieve-internal to retry the request.

This time, url-retrieve-internal will add in the authentication header,
and so the request will succeed in a 200.  At that point
url-retrieve-will return the buffer the response is in,
url-http-handle-authentication will return that buffer, but
url-http-parse-header will drop that new buffer on the floor, silently.

In a similar case, url-http-parse-header will for a 30X redirect uris,
set a buffer local variable url-redirect-buffer.

It would seem that something similar to this needs to be done for 401
Unauthorized basic authentication.

In GNU Emacs (i386-mingw-nt6.1.7601)
 of 2011-09-19 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 6.1.7601
configured using `configure --with-gcc (4.5) --no-opt'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
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  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
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Recent input:
C-s C-s C-s C-l C-a C-n C-n C-n C-n C-n C-n C-f C-a
C-s C-a C-s u r l - h t t p - h a n d l e - a u C-s
C-s C-r C-r C-r C-a C-a C-s u r l - b a s i c - a C-s
C-a C-x 2 C-x o <escape> x f i n d - g r e p <return>
u r l - b u g - a d C-a C-f C-f C-f C-f C-f C-f C-f
- n a m e SPC * <backspace> " * e l " SPC C-e <return>
C-x p C-x p q C-x p C-x 0 C-x o C-a C-s u r l - t <backspace>
r e t r i C-a <escape> C-f C-e <escape> C-b C-s u r
l - h t t p - h a n d l e - a u t h e t <backspace>
n t i c a t i o n C-a C-x o C-x b * U R <tab> <return>
C-s h a n d l i n e <backspace> g C-s C-a C-x o C-x
2 C-x o <escape> x <up> <return> <up> C-e C-b C-b C-b
C-b C-b C-b <escape> <backspace> <escape> <backspace>
h t t p - h a n d l e <return> <escape> < C-s h r l
- <backspace> <backspace> <backspace> <backspace> u
r l - h a n d l <backspace> <backspace> <backspace>
<backspace> t t p - h a n d l e - a C-s C-s C-r C-r
C-a C-l C-x 1 C-e C-b <down-mouse-1> <mouse-1> C-x
3 <escape> x r p o <backspace> <backspace> e p o r
t - b u g <escape> b e m a c s - <return>

Recent messages:
Mark saved where search started
Mark set
Mark saved where search started
Mark set
Mark saved where search started [3 times]
Grep finished (matches found)
Mark saved where search started [3 times]
Grep finished (matches found)
Mark set
Mark saved where search started

Load-path shadows:
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text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
multi-tty emacs)

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