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Animated GIFs not rendering at non-nominal resolutions
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Description

Animated GIFs (from Commons, as I don't have local examples) are not being displayed (broken image symbol displayed) when a thumbnail resolution is specified (different from nominal res).

Examples:

In https://pt.wiktionary.org/w/index.php?oldid=1996491#avant_la_lettre:
https://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Movicon2-good.gif/30px-Movicon2-good.gif
for [[commons:File:Movicon2-good.gif]].

In https://en.wikipedia.org/wiki/Foucault_pendulum:
//upload.wikimedia.org/wikipedia/commons/thumb/8/82/Foucault-rotz.gif/250px-Foucault-rotz.gif
for [[en:w:Foucault_pendulum]] (2nd image, animated)

Tested with Chrome 45 and Firefox 40.

Event Timeline

Malafaya created this task.Sep 4 2015, 10:12 PM
Malafaya raised the priority of this task from to Medium.
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Jdforrester-WMF moved this task from Untriaged to Backlog on the Multimedia board.Sep 8 2015, 12:37 AM

I'm not sure it's related but some project logos, such as Wiktionaries logos, don't appear either.

Request data from Firefox:

GET /static/images/project-logos/bewiktionary.png HTTP/1.1
Host: be.wiktionary.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:41.0) Gecko/20100101 Firefox/41.0
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: en-US,en;q=0.7,pt;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Referer: https://be.wiktionary.org/w/load.php?debug=false&lang=be&modules=ext.echo.badgeicons%7Cext.echo.styles.badge%7Cext.inputBox.styles%7Cext.uls.nojs%7Cmediawiki.legacy.commonPrint%2Cshared%7Cmediawiki.sectionAnchor%7Cmediawiki.skinning.interface%7Cmediawiki.ui.button%2Ccheckbox%2Cinput%7Cskins.vector.styles&only=styles&skin=vector
Cookie: GeoIP=XX:XX:xx:XXXX:XXXX:v4; centralauth_User=Malafaya; centralauth_Session=XXXXXXXX8fb0c76e7797772851adee98; forceHTTPS=1; bewiktionarySession=XXXXXXXX4b21ef8ed740e7cab837fade; WMF-Last-Access=24-Oct-2015
Connection: keep-alive

Response: nothing is received (0 bytes).