Last modified: 2008-02-13 06:47:05 UTC

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Bug 4816 - CAPTCHA image not displaying
CAPTCHA image not displaying
Product: MediaWiki
Classification: Unclassified
User login and signup (Other open bugs)
PC All
: Low normal (vote)
: ---
Assigned To: Nobody - You can work on this!
Depends on:
  Show dependency treegraph
Reported: 2006-02-01 00:25 UTC by Connel MacKenzie
Modified: 2008-02-13 06:47 UTC (History)
1 user (show)

See Also:
Web browser: ---
Mobile Platform: ---
Assignee Huggle Beta Tester: ---

screen dump - eu.wikipedia - captcha image not displayed - 01.jpg (141.99 KB, image/jpeg)
2008-02-10 02:21 UTC, lɛʁi לערי ריינהארט

Description Connel MacKenzie 2006-02-01 00:25:04 UTC
An anonymous IP reported that they were unable to see the CAPTCHA
image.  Viewing the link provided I am able to see the image in several
browsers.  They did not report their browser or platform.  (I do not know if you
can determine that from logs...or if logs are even turned on for this one
subcomponent.)  --~~~~
Comment 1 Brion Vibber 2006-02-01 00:29:58 UTC
They'll need to provide information.

Note that the captcha images won't display correctly if cookies are disabled.
Comment 2 James Barrett 2006-02-01 01:01:09 UTC
Thanks - firewall was catching the 3rd party cookie and that fixed it.  
Comment 3 Brion Vibber 2006-02-01 01:02:41 UTC
There shouldn't be any third-party cookies, just same-party cookies. Can you show me 
what the cookie looks like and what setting caught it?
Comment 4 Connel MacKenzie 2006-02-06 04:56:20 UTC
I haven't reproduced this user's scenario.  But I did add an extra warning at which has made the
complaints stop for now.
Comment 5 omniplex 2006-06-29 15:27:54 UTC
Just commented on a related bug, it doesn't work
in some constellations even if cookies are enabled
and the browser supports PNG, a wild guess is "file
name issue", the URL is ..."&wpCaptchaId=123456789" 
without file extension PNG or whatever it is.

Because I cant load a single exemplar I also can't
check if something's unusual in its HTTP header.
Comment 6 Andrew Garrett 2006-11-26 00:13:36 UTC
No information provided. Closing as WORKSFORME
Comment 7 lɛʁi לערי ריינהארט 2008-02-10 02:21:41 UTC
Created attachment 4637 [details]
screen dump - eu.wikipedia - captcha image not displayed - 01.jpg

screen dump from

c) Konqueror 3.5.5 (Using KDE 3.5.5)
on KDE version 3.5.5; System: Linux; Release: 2.6.22-gentoo-r2; Machine: i686

it works on

a) Mozilla/5.0 (X11; U; Linux i686; de; rv: Gecko/20070427 Firefox/ on Linux KDE 3.5.5
b) Opera see configuration at
all on KDE version 3.5.5; System: Linux; Release: 2.6.22-gentoo-r2; Machine: i686

the same happens at

the captcha image is visible for about three seconds and then disapears

best regards Reinhardt [[user:Gangleri]]
Comment 8 lɛʁi לערי ריינהארט 2008-02-10 02:24:12 UTC
REOPENing this bug

comment #7 is quite st*pid. Should a hint abpout using another browser should be added when captcha is used?
Comment 9 Brion Vibber 2008-02-13 06:22:00 UTC
I do seem able to reproduce this with Konqueror 3.5.8 on Ubuntu Gutsy.

The image nearly always disappears (replaced by a tiny generic file icon) after something causes it to redraw, such as dragging a section over it or scrolling down, then back up.

I haven't been able to reproduce the problem on my local MediaWiki install, however, so there may be some sort of difference in the caching headers or some other behavior triggering it.
Comment 10 Brion Vibber 2008-02-13 06:47:05 UTC
Seem to have fixed this in r30900.

Made two changes:
* An explicit cache-control header allowing private caching. (No effect, but seems wise to have.)
* Commented out the 403 Access Denied on subsequent loads of an already-viewed captcha image. This allows Konqueror to reload the image (god knows why) without losing it, so it doesn't disappear.

Since the image references are tied to the session, this _probably_ doesn't weaken the captcha much. But it'd be nice to know why Konqi is doing this crazy thing and how to stop it. :D

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