bug#21017: url-http: synchronous post and 302 error response not handled properly

bug#21017: url-http: synchronous post and 302 error response not handled properly

[Vaidheeswaran C]

[-- Attachment #1: Type: text/plain, Size: 6078 bytes --]


url-http: synchronous post and 302 error response not handled
properly.  This is seen with Oddmuse wikis.

GNU Emacs is from today's master branch.

----------------------------------------------------------------

Prerequisites:

You need an oddmuse wiki that you have write access to.

----------------------------------------------------------------

The snippet below posts the "Hello Everywhere" (the "text") on to
"TemporaryPage" (the "title").

(let* ((wiki-base-url "http://localhost/cgi-bin/wiki.pl/")
       (values
	`(("pwd" . "xxxx")
	  ("recent_edit" . "off")
	  ("summary" . "Some updates")
	  ("text" . "Hello Everywhere")
	  ("title" . "TemporaryPage")
	  ("username" . "Anonymous"))))
  (let ((url-request-method "POST")
	(url-request-extra-headers
	 '(("Content-Type" . "application/x-www-form-urlencoded")))
	(url-request-data (mm-url-encode-www-form-urlencoded values)))
    (url-retrieve-synchronously wiki-base-url)
    (message "Done")))

1. Get hold of an oddmuse wiki that you have edit access to
2. Customize `url-debug' to t
3. C-x C-e the above snippet
4. See that the "Done" message gets never printed.
5. C-g your way out.
6. Verify that Oddmuse wiki page has been updated.

----------------------------------------------------------------

The HTTP process buffer says:

    HTTP/1.1 302 Found
    Status: 302 Found
    Location: http://localhost/cgi-bin/wiki.pl/TemporaryPage
    Transfer-Encoding: chunked
    Date: Thu, 09 Jul 2015 07:32:42 GMT
    Server: lighttpd/1.4.31

----------------------------------------------------------------

The *URL-DEBUG* buffer says infinite "spinning" for headers.

    http -> Contacting host: localhost:80
    http -> Marking connection as busy: localhost:80 #<process localhost>
    retrieval -> Spinning in url-retrieve-synchronously: nil (#<buffer
*http localhost:80*>)
    http -> Request is:
    POST /cgi-bin/wiki.pl/ HTTP/1.1
    MIME-Version: 1.0
    Connection: keep-alive
    Extension: Security/Digest Security/SSL
    Host: localhost
    Accept-encoding: gzip
    Accept-charset: utf-8;q=1, gb2312;q=0.5, iso-8859-1;q=0.5,
big5;q=0.5, iso-2022-jp;q=0.5, shift_jis;q=0.5, euc-tw;q=0.5,
euc-jp;q=0.5, euc-jis-2004;q=0.5, euc-kr;q=0.5, us-ascii;q=0.5,
utf-7;q=0.5, hz-gb-2312;q=0.5, big5-hkscs;q=0.5, gbk;q=0.5,
gb18030;q=0.5, iso-8859-5;q=0.5, koi8-r;q=0.5, koi8-u;q=0.5,
cp866;q=0.5, koi8-t;q=0.5, windows-1251;q=0.5, cp855;q=0.5,
iso-8859-2;q=0.5, iso-8859-3;q=0.5, iso-8859-4;q=0.5, iso-8859-9;q=0.5,
iso-8859-10;q=0.5, iso-8859-13;q=0.5, iso-8859-14;q=0.5,
iso-8859-15;q=0.5, windows-1250;q=0.5, windows-1252;q=0.5,
windows-1254;q=0.5, windows-1257;q=0.5, cp775;q=0.5, cp850;q=0.5,
cp852;q=0.5, cp857;q=0.5, cp858;q=0.5, cp860;q=0.5, cp861;q=0.5,
cp863;q=0.5, cp865;q=0.5, cp437;q=0.5, macintosh;q=0.5, next;q=0.5,
hp-roman8;q=0.5, adobe-standard-encoding;q=0.5, iso-8859-16;q=0.5,
iso-8859-7;q=0.5, windows-1253;q=0.5, cp737;q=0.5, cp851;q=0.5,
cp869;q=0.5, iso-8859-8;q=0.5, windows-1255;q=0.5, cp862;q=0.5,
iso-2022-jp-2004;q=0.5, cp874;q=0.5, iso-8859-11;q=0.5, viscii;q=0.5,
windows-1258;q=0.5, iso-8859-6;q=0.5, windows-1256;q=0.5,
iso-2022-cn;q=0.5, iso-2022-cn-ext;q=0.5, iso-2022-jp-2;q=0.5,
iso-2022-kr;q=0.5, utf-16le;q=0.5, utf-16be;q=0.5, utf-16;q=0.5,
x-ctext;q=0.5
    Accept: */*
    User-Agent: URL/Emacs
    Cookie: Wiki=pwd%251exxxx%251eusername%251eAnonymous
    Content-Type: application/x-www-form-urlencoded
    Content-length: 101


pwd=xxxx&recent_edit=off&summary=Some+updates&text=Hello+World&title=TemporaryPage&username=Anonymous
    http -> Calling after change function
`url-http-wait-for-headers-change-function' for `#<process localhost>'
    http -> url-http-wait-for-headers-change-function ( *http localhost:80*)
    http -> Saw end of headers... ( *http localhost:80*)
    http -> url-http-parse-response called in ( *http localhost:80*)
    http -> Saw chunked encoding.
    http -> Calling initial chunked-encoding for extra data at end of
headers
    http -> Reading chunk 0 (182 183 1)
    http -> Did not see start of chunk @ 183!
    http -> Spinning waiting for headers...
    retrieval -> Spinning in url-retrieve-synchronously: nil (#<buffer
*http localhost:80*>)
    http -> Calling after change function
`url-http-chunked-encoding-after-change-function' for `#<process localhost>'
    http -> Reading chunk 0 (183 188 5)
    http -> Saw start of chunk 1 (length=0, start=183
    http -> Saw end of stream chunk!
    http -> Removing terminator of last chunk
    http -> Saw end of trailers...
    http -> Marking connection as free: localhost:80 #<process localhost>
    http -> url-http-parse-headers called in ( *http localhost:80*)
    http -> url-http-parse-response called in ( *http localhost:80*)
    http -> Parsed HTTP headers: class=3 status=302
    http -> Finished parsing HTTP headers: nil
    retrieval -> Spinning in url-retrieve-synchronously: nil (#<buffer
*http localhost:80*>)
    retrieval -> Spinning in url-retrieve-synchronously: nil (#<buffer
*http localhost:80*>)

----------------------------------------------------------------

Hint for quick isolation:

If I comment out the `unless' part below (cf. url-http.el @ line 602)
thereabouts, the spinning stops altogether.


    ((or `moved-permanently `found `temporary-redirect) ; 301 302 307
     ;; If the 301|302 status code is received in response to a
     ;; request other than GET or HEAD, the user agent MUST NOT
     ;; automatically redirect the request unless it can be
     ;; confirmed by the user, since this might change the
     ;; conditions under which the request was issued.
     (unless (member url-http-method '("HEAD" "GET"))
       (setq redirect-uri nil)))

----------------------------------------------------------------

Expected behaviour:

I am attaching an edit transaction done via firefox + emacswiki
(captured with "follow TCP stream" option of wireshark)

I see a 302 response followed by a fetch of the edited page.  Whatever
be the right behaviour, I expect that synchronous fetch doesn't loop
infinitely and make emacs unusable.

[-- Attachment #2: oddmuse-edit-via-firefox.txt --]
[-- Type: text/plain, Size: 19114 bytes --]

GET /emacs?action=edit;id=Test HTTP/1.1
Host: www.emacswiki.org
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.3.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://www.emacswiki.org/emacs/Test
Cookie: Wiki=uihnscuskc%251e1%251eusername%251eAnonymous
Connection: keep-alive

HTTP/1.1 200 OK
Server: nginx/1.4.6 (Ubuntu)
Date: Thu, 09 Jul 2015 08:04:10 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Content-Location: emacs.pl
Vary: negotiate,Accept-Language
TCN: choice
X-EmacsWiki-Source: Apache/CGI
X-Proxy-Cache: BYPASS

d15
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<link type="text/css" rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css" />
<link type="text/css" rel="stylesheet" href="/css/bootstrap.css" />
<meta name="robots" content="NOINDEX,FOLLOW" /><link rel="alternate" type="application/rss+xml" title="EmacsWiki" href="http://www.emacswiki.org/emacs?action=rss" /><link rel="alternate" type="application/rss+xml" title="EmacsWiki: Test" href="http://www.emacswiki.org/emacs?action=rss;rcidonly=Test" /><link rel="alternate" type="application/rss+xml" title="Follow-ups for Anonymous" href="http://www.emacswiki.org/emacs?action=rss;followup=Anonymous" />
<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki with page content"
      href="http://www.emacswiki.org/full.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki with page content and diff"
      href="http://www.emacswiki.org/full-diff.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki including minor differences"
      href="http://www.emacswiki.org/minor-edits.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Changes for Test only"
      href="http://www.emacswiki.org/emacs?action=rss;rcidonly=Test" />
<link rel="alternate" type="application/rss+xml"
      title="Follow-ups to Anonymous"
      href="http://www.emacswiki.org/emacs?action=rss;followup=Anonymous" />
<meta name="viewport" content="width=device-width" />
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/js/bootstrap.min.js"></script>
<script type="text/javascript" src="http://emacswiki.org/bootstrap.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body class="http://www.emacswiki.org/emacs"><div class="header"><div class="menu"><span class="gotobar bar"><a href="http://www.emacswiki.org/emacs/SiteMap" class="local">SiteMap</a> <a href="http://www.emacswiki.org/emacs/Search" class="local">Search</a> <a href="http://www.emacswiki.org/emacs/ElispArea" class="local">ElispArea</a> <a href="http://www.emacswiki.org/emacs/HowTo" class="local">HowTo</a> <a href="http://www.emacswiki.org/emacs/Glossary" class="local">Glossary</a> <a href="http://www.emacswiki.org/emacs/RecentChanges" class="local">RecentChanges</a> <a class="local" href="http://www.emacswiki.org/emacs/News">News</a> <a class="local" href="http://www.emacswiki.org/emacs/Problems">Problems</a> <a href="http://www.emacswiki.org/emacs/Suggestions" class="local">Suggestions</a> </span><form method="get" action="http://www.emacswiki.org/emacs" enctype="multipart/form-data" accept-charset="utf-8" class="search"><p><label for="search">Search:</label> <input type="text" name="search"  size="20" id="search" accesskey="f" /> <label for="searchlang">Language:</label> <input type="text" name="lang"  size="10" id="searchlang" /> <input type="submit" name="dosearch" value="Go!" /></p></form></div><h1>Editing Test</h1></div><div class="wrapper"><div class="content edit">
5b9
<form method="post" action="http://www.emacswiki.org/emacs" enctype="multipart/form-data" accept-charset="utf-8" class="edit text"><p><input name="title" type="hidden" value="Test" />  <input name="oldtime" type="hidden" value="1436428940" /> <textarea name="text"  rows="25" cols="78" id="text">Hello World
</textarea></p><p>Summary:<br /><textarea name="summary"  rows="2" cols="78" id="summary"></textarea></p><p><label><input type="checkbox" name="recent_edit" value="on" />This change is a minor edit.</label></p><p>Please make sure you contribute only your own work. IP numbers are made available via the page history. If you want to keep it a secret, you need to use <a href="http://www.torproject.org/">Tor</a>. See <a href="/emacs/TextFormattingRules">TextFormattingRules</a> for how to format text. See <a href="/emacs/StyleGuide">StyleGuide</a> for the suggested writing style on this wiki.</p><p><label for="username">Username:</label> <input type="text" name="username" value="Anonymous" size="20" maxlength="50" id="username" /></p><p><input type="submit" name="Save" value="Save" accesskey="s" />  <input type="submit" name="Preview" value="Preview" accesskey="p" /> <input type="submit" name="Cancel" value="Cancel" /></p><p><a class="upload" href="http://www.emacswiki.org/emacs?action=edit;upload=1;id=Test" rel="nofollow">Replace this text with a file</a></p><div><input type="hidden" name=".cgifields" value="recent_edit"  /></div>
</form></div>
27
<div class="wrapper close"></div></div>
1a
<div class="footer"><hr />
1df
<div class="edit bar"><a rel="nofollow" class="history" href="http://www.emacswiki.org/emacs?action=history;id=Test">View other revisions</a> <a class="local" href="http://www.emacswiki.org/emacs/Test">View current revision</a> <a rel="nofollow" href="http://www.emacswiki.org/emacs?action=rc;all=1;from=1;showedit=1;rcidonly=Test" class="rc">View all changes</a> <a rel="nofollow" class="admin" href="http://www.emacswiki.org/emacs?action=admin;id=Test">Administration</a></div>
764
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License, the XEmacs manual license, or
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11

</body>
</html>

0

POST /emacs HTTP/1.1
Host: www.emacswiki.org
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.3.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://www.emacswiki.org/emacs?action=edit;id=Test
Cookie: Wiki=uihnscuskc%251e1%251eusername%251eAnonymous
Connection: keep-alive
Content-Type: multipart/form-data; boundary=---------------------------208698956014414866461469291549
Content-Length: 921

-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="title"

Test
-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="oldtime"

1436428940
-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="text"

Hello World!

-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="summary"

This is a spam edit
-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="username"

Anonymous
-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name="Save"

Save
-----------------------------208698956014414866461469291549
Content-Disposition: form-data; name=".cgifields"

recent_edit
-----------------------------208698956014414866461469291549--
HTTP/1.1 302 Found
Server: nginx/1.4.6 (Ubuntu)
Date: Thu, 09 Jul 2015 08:04:32 GMT
Content-Type: text/x-perl
Content-Length: 0
Connection: keep-alive
Location: http://www.emacswiki.org/emacs/Test
X-EmacsWiki-Source: Apache/CGI

GET /emacs/Test HTTP/1.1
Host: www.emacswiki.org
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.3.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://www.emacswiki.org/emacs?action=edit;id=Test
Cookie: Wiki=uihnscuskc%251e1%251eusername%251eAnonymous
Connection: keep-alive

HTTP/1.1 200 OK
Server: nginx/1.4.6 (Ubuntu)
Date: Thu, 09 Jul 2015 08:04:33 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Language
X-EmacsWiki-Source: Apache/CGI
X-Proxy-Cache: BYPASS

ec4
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>EmacsWiki: Test</title><link rel="alternate" type="application/wiki" title="Edit this page" href="http://www.emacswiki.org/emacs?action=edit;id=Test" />
<link type="text/css" rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.0/css/bootstrap-combined.min.css" />
<link type="text/css" rel="stylesheet" href="/css/bootstrap.css" />
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<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki with page content"
      href="http://www.emacswiki.org/full.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki with page content and diff"
      href="http://www.emacswiki.org/full-diff.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Emacs Wiki including minor differences"
      href="http://www.emacswiki.org/minor-edits.rss" />
<link rel="alternate" type="application/rss+xml"
      title="Changes for Test only"
      href="http://www.emacswiki.org/emacs?action=rss;rcidonly=Test" />
<link rel="alternate" type="application/rss+xml"
      title="Follow-ups to Anonymous"
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739

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bug#21017: url-http: synchronous post and 302 error response not handled properly

[Glenn Morris]

Dupe of http://debbugs.gnu.org/16960