Last modified: 2014-03-10 18:07:58 UTC
Some users of DoComo's feature phones from Japan has reported that they cannot access any Wikipedia pages with their device. The problem has been reported repeatedly since early November 2013. It seems that they are not redirected to ja.m.wikipedia.org from ja.wikipedia.org. They say that it works when they go to http://ja.m.wikipedia.org/wiki/* directly. Some of the affected devices (according to the reports): * NTT Docomo SH-03A (User-agent: "DoCoMo/2.0 SH03A") * NTT Docomo SH-01C (User-agent: "DoCoMo/2.0 SH01C") * NTT Docomo F-01C (User-agent: "DoCoMo/2.0 F01C") Reports: * https://ja.wikipedia.org/wiki/WP:BUG#.E3.83.95.E3.82.A3.E3.83.BC.E3.83.81.E3.83.A3.E3.83.BC.E3.83.95.E3.82.A9.E3.83.B3.E3.81.8B.E3.82.89.E3.81.AE.E9.96.B2.E8.A6.A7.E3.81.8C.E5.87.BA.E6.9D.A5.E3.81.AA.E3.81.84 * http://d.hatena.ne.jp/a_happy_ending/20131230/1388389603 (with screenshot) * http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13118343363 (with screenshot)
Did some investigation on this: * The error is emitted not by WMF sites but by some intermediate DoCoMo proxy, we don't output 502 errors in Japanese. * It happens only upon redirecting from desktop site to mobile. * Early November coincides nicely with our switch of desktop sites from Squid to Varnish - this could have slightly altered responses. * I couldn't reproduce this bug in their simulator: https://www.nttdocomo.co.jp/english/service/developer/make/content/browser/html/tool2/download/
I'm not sure if this is relevant, but some (who experience the same problem) suggest emitting the "Content-Length" header in the response to deal with this 502 error: http://umakoya.com/blog/log/eid179.html According to the specifications given by Docomo, their browsers (and proxies, too?) require the "Content-Length" header: https://www.nttdocomo.co.jp/english/service/developer/make/content/browser/xhtml/notice/basis/
Prioritization and scheduling of this bug is tracked on Mingle card https://wikimedia.mingle.thoughtworks.com/projects/mobile/cards/1750
Change 117471 had a related patch set uploaded by MaxSem: Always output Content-Length on mobile redirect https://gerrit.wikimedia.org/r/117471
Change 117471 merged by Faidon Liambotis: Always output Content-Length on mobile redirect https://gerrit.wikimedia.org/r/117471
Let's see if this patch fixes the problem. Please reopen if it doesn't!
