bug#21089: 24.5; void-variable url-http-response-status

bug#21089: 24.5; void-variable url-http-response-status

[Milan Zamazal]

I use org2blog package from MELPA to interact with my WordPress site.
When I perform

  M-x org2blog/wp-login RET    (password prompt appears)
  xxx RET

I receive the following error:

Debugger entered--Lisp error: (void-variable url-http-response-status)
  (/ url-http-response-status 100)
  (let* ((buffer (current-buffer)) (class (/ url-http-response-status 100)) (success nil) (status-symbol (cadr (assq url-http-response-status url-http-codes)))) (url-http-debug "Parsed HTTP headers: class=%d status=%d" class url-http-response-status) (if (progn (or (and (memq (aref url-http-target-url 0) cl-struct-url-tags)) (error "%s accessing a non-%s" (quote url-use-cookies) (quote url))) (aref url-http-target-url 11)) (progn (url-http-handle-cookies))) (cond ((eq class (quote 1)) (let nil (url-mark-buffer-as-dead buffer) (error "HTTP responses in class 1xx not supported (%d)" url-http-response-status))) ((eq class (quote 2)) (let nil (if (memq status-symbol (quote (no-content reset-content))) (let nil (url-mark-buffer-as-dead buffer)) (let nil (widen) (if (and url-automatic-caching ...) (url-store-in-cache buffer)))) (setq success t))) ((eq class (quote 3)) (let nil (let ((redirect-uri (or ... ...))) (cond ((eq status-symbol ...) (let nil nil)) ((memq status-symbol ...) (let nil ...)) ((eq status-symbol ...) (let nil ...)) ((eq status-symbol ...) (let nil ... ... ...)) ((eq status-symbol ...) (let nil ...)) (t (let nil nil))) (if redirect-uri (progn (if ... ...) (if ... ...) (if ... ...) (let ... ...)))))) ((eq class (quote 4)) (let nil (setq success (cond ((eq status-symbol ...) (let nil ...)) ((eq status-symbol ...) (let nil ... ...)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil ...)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((memq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) ((eq status-symbol ...) (let nil t)) (t (let nil t)))) (if success (progn (let* (...) (setcar v ...)))))) ((eq class (quote 5)) (let nil (setq success t) (cond ((eq url-http-response-status (quote not-implemented)) (let nil nil)) ((eq url-http-response-status (quote bad-gateway)) (let nil nil)) ((eq url-http-response-status (quote service-unavailable)) (let nil nil)) ((eq url-http-response-status (quote gateway-timeout)) (let nil nil)) ((eq url-http-response-status (quote http-version-not-supported)) (let nil nil)) ((eq url-http-response-status (quote insufficient-storage)) (let nil nil)) (t nil)) (if success (progn (let* (...) (setcar v ...)))))) (t (let nil (error "Unknown class of HTTP response code: %d (%d)" class url-http-response-status)))) (if (not success) (url-mark-buffer-as-dead buffer) (url-handle-content-transfer-encoding)) (url-http-debug "Finished parsing HTTP headers: %S" success) (widen) (goto-char (point-min)) success)
  url-http-parse-headers()
  url-http-content-length-after-change-function(228 435 207)
  url-http-wait-for-headers-change-function(1 445 444)
  url-http-generic-filter(#<process weblog.zamazal.org> "HTTP/1.1 200 OK.\nServer: nginx/1.2.1.\nDate: Sat, 18 Jul 2015 19:36:51 GMT.\nContent-Type: text/xml; charset=UTF-8.\nContent-Length: 206.\nConnection: close.\nX-Powered-By: PHP/5.4.41-0+deb7u1.\nVary: Accept-Encoding.\nContent-Encoding: gzip.\n.\n\x1f\213\b.\0.\0.\0.\205PK.\2020.\334s\212\206\275.\243\v.\217\26201q\353\347.\bO%\241-ym\321\343[>*\230\250\273\231\351t\246.H\357\262b.\222)\265J\302y.\207\fU\256\213R]\222\360x\330\314Va*.\220h\257\272\330\241\251\2652(.\306\340\234\271\312\266\310\343&\253.\366\3303c\311\345\366I\275 Q\236\220\336\202\227T&Qt.k] \360\216\217.}$\224\312\212e\274.\336.\340\223\"\357\342\237\321\277\273\366\226\374\307\276\267\231\356\\l\375.D\230[\346\fRkf\232X\235.s\323TD\300\a\337\337\367t\316\327.#;\360a\276\366\306t\332\aj\210\354V\223.\0.")
  accept-process-output(#<process weblog.zamazal.org>)
  #[0 "\302.\303\300\242!)\207" [(#<process weblog.zamazal.org>) inhibit-quit nil accept-process-output] 2 "\n\n(fn)"]()
  funcall(#[0 "\302.\303\300\242!)\207" [(#<process weblog.zamazal.org>) inhibit-quit nil accept-process-output] 2 "\n\n(fn)"])
  url-retrieve-synchronously("http://weblog.zamazal.org/xmlrpc.php")
  xml-rpc-request("http://weblog.zamazal.org/xmlrpc.php" ((methodCall nil (methodName nil "metaWeblog.getCategories") (params nil (param nil (value nil (string nil "1"))) (param nil (value nil (string nil "admin"))) (param nil (value nil (string nil "xxx")))))) nil)
  xml-rpc-method-call-async(nil "http://weblog.zamazal.org/xmlrpc.php" "metaWeblog.getCategories" ("1" "admin" "xxx"))
  xml-rpc-method-call("http://weblog.zamazal.org/xmlrpc.php" "metaWeblog.getCategories" "1" "admin" "xxx")
  metaweblog-get-categories("http://weblog.zamazal.org/xmlrpc.php" "admin" "xxx" "1")
  org2blog/wp-login()

I tried to debug the problem and found out that something wrong happens
in function `url-http-parse-headers' from url-http.el.  While
`url-http-response-status' is set in the call (url-http-parse-response)
and visible in `url-http-parse-headers' afterwards, it disappears after
the call (delete-process url-http-process) later in
`url-http-parse-headers', before it is used there.  Maybe the variable
is buffer local and gets lost together with the process buffer.


In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.5)
 of 2015-06-29 on blackbird, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.1 (jessie)

Configured using:
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/usr/share/emacs/24.5/site-lisp/slime/lib/ert hides /usr/share/emacs/24.5/lisp/emacs-lisp/ert

Features:
(shadow flyspell emacsbug eieio-opt pcase edebug debug url-cache ispell
smex dictionary link connection dired-aux misearch multi-isearch epg
sort smiley gnus-cite mail-extr gnus-async gnus-bcklg gnus-dup gnus-ml
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org-datetree mule-util cal-move parse-time time-stamp cal-iso cal-china
lunar solar cal-dst cal-bahai cal-islam cal-hebrew cal-julian holidays
hol-loaddefs diary-lib diary-loaddefs hl-line debian-control-mode
php-mode speedbar sb-image ezimage dframe flymake arduino-mode conf-mode
make-mode tex-info texinfo debian-copyright imenu debian-bug
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cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
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nnoo gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec
gnus-int gnus-range message sendmail rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mailabbrev gmm-utils mailheader gnus-win gnus
gnus-ems nnheader mail-utils org-checklist org-bibtex bibtex autoinsert
auto-capitalize view hydra lv persp-mode window-purpose
window-purpose-fixes window-purpose-prefix-overload
window-purpose-switch let-alist window-purpose-layout
window-purpose-core window-purpose-configuration window-purpose-utils
saveplace desktop frameset server initsplit warnings cus-edit cus-start
cus-load wid-edit org2blog ox-wp ox-latex ox-icalendar ox-html ox-ascii
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url-proxy url-privacy url-expand url-methods url-history mailcap
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mc-hide-unmatched-lines-mode mc-separate-operations
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mc-edit-lines multiple-cursors-core rect howdoi buffer-move windmove
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mm-util mail-prsvr password-cache tramp-loaddefs trampver shell
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disp-table cl-macs mb-depth cl gv cl-loaddefs cl-lib init-loader
benchmark ace-jump-mode-autoloads ampc-autoloads tex-site
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connection-autoloads el-x-autoloads elnode-autoloads db-autoloads
creole-autoloads fakir-autoloads advice help-fns kv-autoloads
link-autoloads marmalade-autoloads furl-autoloads message-x-autoloads
org2blog-autoloads paredit-menu-autoloads s-autoloads info easymenu
package epg-config debian-el debian-el-loaddefs slime-autoloads
dpkg-dev-el dpkg-dev-el-loaddefs time-date tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 1201010 135638)
 (symbols 48 69835 0)
 (miscs 40 36994 14612)
 (strings 32 215104 22914)
 (string-bytes 1 6508802)
 (vectors 16 117804)
 (vector-slots 8 3910300 53550)
 (floats 8 22745 58)
 (intervals 56 13999 335)
 (buffers 960 155)
 (heap 1024 130174 4335))

bug#21089: 24.5; void-variable url-http-response-status

[Lars Ingebrigtsen]

Milan Zamazal <pdm@zamazal.org> writes:

> I tried to debug the problem and found out that something wrong happens
> in function `url-http-parse-headers' from url-http.el.  While
> `url-http-response-status' is set in the call (url-http-parse-response)
> and visible in `url-http-parse-headers' afterwards, it disappears after
> the call (delete-process url-http-process) later in
> `url-http-parse-headers', before it is used there.  Maybe the variable
> is buffer local and gets lost together with the process buffer.

Yes, that sounds likely.  Emacs 25.1 has gotten a few fixes in this
area, I think.  Do you still see this problem in newer versions?

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

bug#21089: 24.5; void-variable url-http-response-status

[Milan Zamazal]

>>>>> "LI" == Lars Ingebrigtsen <larsi@gnus.org> writes:

    LI> Emacs 25.1 has gotten a few fixes in this area, I think.  Do you
    LI> still see this problem in newer versions?

Yes, current git version (master) signals the same error.

-- 
http://www.zamazal.org

bug#21089: 24.5; void-variable url-http-response-status

[Lars Magne Ingebrigtsen]

Milan Zamazal <pdm@zamazal.org> writes:

>>>>>> "LI" == Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>     LI> Emacs 25.1 has gotten a few fixes in this area, I think.  Do you
>     LI> still see this problem in newer versions?
>
> Yes, current git version (master) signals the same error.

Could you try to replicate the bug without using all these packages not
in "emacs -Q"?  This is the end of the backtrace:

  ...
  url-retrieve-synchronously("http://weblog.zamazal.org/xmlrpc.php")
  xml-rpc-request("http://weblog.zamazal.org/xmlrpc.php" ((methodCall nil (methodName nil "metaWeblog.getCategories") (params nil (param nil (value nil (string nil "1"))) (param nil (value nil (string nil "admin"))) (param nil (value nil (string nil "xxx")))))) nil)
  xml-rpc-method-call-async(nil "http://weblog.zamazal.org/xmlrpc.php" "metaWeblog.getCategories" ("1" "admin" "xxx"))
  xml-rpc-method-call("http://weblog.zamazal.org/xmlrpc.php" "metaWeblog.getCategories" "1" "admin" "xxx")
  metaweblog-get-categories("http://weblog.zamazal.org/xmlrpc.php" "admin" "xxx" "1")
  org2blog/wp-login()

My guess is that the call to xml-rpc-request binds a bunch of url
variables, and then calls url-retrieve-synchronously.  Could you
determine what those variables are, and then create a test case?

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

bug#21089: 24.5; void-variable url-http-response-status

[Milan Zamazal]

[-- Attachment #1: Type: text/plain, Size: 435 bytes --]

>>>>> "LMI" == Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

    LMI> Could you try to replicate the bug without using all these
    LMI> packages not in "emacs -Q"?

It was a bit tricky (curious case!), but I’ve found it.

Run Emacs with the attached file:

  emacs -Q -l url-http-bug.el

When prompted for password, press Enter.  You should get the bug (with
both Emacs 24.5 or git master from end of December).


[-- Attachment #2: url-http-bug.el --]
[-- Type: application/emacs-lisp, Size: 220 bytes --]

[-- Attachment #3: Type: text/plain, Size: 28 bytes --]


-- 
http://www.zamazal.org

bug#21089: 24.5; void-variable url-http-response-status

[Lars Ingebrigtsen]

Milan Zamazal <pdm@zamazal.org> writes:

> It was a bit tricky (curious case!), but I’ve found it.
>
> Run Emacs with the attached file:
>
>   emacs -Q -l url-http-bug.el
>
> When prompted for password, press Enter.  You should get the bug (with
> both Emacs 24.5 or git master from end of December).
>
> (require 'follow)
> (follow-mode 1)
> (defun foo ()
>   (read-passwd (format "Password? "))
>   (let ((url-request-extra-headers '(("Connection" . "close"))))
>     (url-retrieve-synchronously "http://www.gnu.org")))
> (foo)

I'm unable to reproduce this bug on the Emacs trunk, so it might have
been fixed in the meantime.  Could you try installing an Emacs 25
pretest (or from git) and see whether the bug still exists?

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

bug#21089: 24.5; void-variable url-http-response-status

[Milan Zamazal]

>>>>> "LI" == Lars Ingebrigtsen <larsi@gnus.org> writes:

    LI> I'm unable to reproduce this bug on the Emacs trunk, so it might
    LI> have been fixed in the meantime.  Could you try installing an
    LI> Emacs 25 pretest (or from git) and see whether the bug still
    LI> exists?

Indeed, it seems to be no longer present in the current pretest, so it
can be closed.  Thanks.

-- 
http://www.zamazal.org