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Maniphest T425545

Investigate Code 414 error when selecting zh-classical (lzh) language from article toolbar
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Description

Steps to replicate the issue (include links if applicable):

  • Open any article in the Wikipedia Android app
  • Tap on the language selector in the toolbar
  • Select zh-classical (lzh)
  • Observe the result

What happens?:
A Code 414 error occurs every time the user selects zh-classical (lzh) from the language selector. The article does not load.

What should have happened instead?:
The article should load normally in the selected language (zh-classical), without any error.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):
App version: 50579-r-2026-04-14
Device: KYOCERA KYG02 (SDK: 35)
Issue occurs every time
Issue occurs only with zh-classical (lzh), not with other languages

1000001732.png (1,080×2,400 px, 97 KB)

Other information (browser name/version, screenshots, etc.):

I was able to reproduce it.

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Event Timeline

ARamadan-WMF created this task.May 6 2026, 1:30 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMay 6 2026, 1:30 PM
Toadette updated the task description. (Show Details)May 6 2026, 7:14 PM
GitHubPRBot added a comment.May 7 2026, 12:06 AM

cooltey opened https://github.com/wikimedia/apps-android-wikipedia/pull/6571

GitHubPRBot added a comment.May 7 2026, 7:26 PM

dbrant closed https://github.com/wikimedia/apps-android-wikipedia/pull/6571

cooltey subscribed.May 7 2026, 8:39 PM

The issue is that the lzh.wikipedia.org does not support API requests (e.g. page/summary or feed/featured), but the zh-classical.wikipedia.org works.

If you visit https://lzh.wikipedia.org, you will be redirected to https://zh-classical.wikipedia.org, which means we need to take it to the other team about handling the redirect correctly.

Seddon added projects: Content-Platform-Team, SRE.May 12 2026, 4:19 PM
Seddon added a subscriber: CDanis.
cooltey edited projects, added: Wikipedia-Android-App (Android Release - FY2025-26); removed: Wikipedia-Android-App.May 12 2026, 4:20 PM
Seddon added subscribers: Jgiannelos, Seddon.May 12 2026, 4:20 PM

@CDanis / @Jgiannelos

cooltey moved this task from Incoming tasks from backlog to QA signoff on the Wikipedia-Android-App (Android Release - FY2025-26) board.May 12 2026, 4:21 PM
CDanis added a project: ServiceOps.May 12 2026, 4:28 PM
CDanis added a subscriber: MLechvien-WMF.
In T425545#11900651, @cooltey wrote:

The issue is that the lzh.wikipedia.org does not support API requests (e.g. page/summary or feed/featured), but the zh-classical.wikipedia.org works.

If you visit https://lzh.wikipedia.org, you will be redirected to https://zh-classical.wikipedia.org, which means we need to take it to the other team about handling the redirect correctly.

@MLechvien-WMF I'm guessing this is something ServiceOps can help with? lzh is implemented as an Apache rewrite, but I'm not sure what else might be needed for API calls to work transparently.

MLechvien-WMF assigned this task to Raine.May 13 2026, 9:16 AM
MLechvien-WMF moved this task from Inbox to Needs Info / Blocked on the ServiceOps board.
MLechvien-WMF added subscribers: Raine, Clement_Goubert.

Thanks for surfacing that.

Assigning to @Raine to assess if something should be done on rest gateway side, cc @Clement_Goubert

ABorbaWMF moved this task from QA signoff to Ready for PM signoff on the Wikipedia-Android-App (Android Release - FY2025-26) board.May 13 2026, 9:06 PM
ABorbaWMF subscribed.

Appears to be fixed on 50586-r-2026-05-12
Tested on:
Pixel 6 on Android 16
OnePlus 8 on Android 13
Galaxy A36

HNordeenWMF moved this task from Ready for PM signoff to Ready for release on the Wikipedia-Android-App (Android Release - FY2025-26) board.May 13 2026, 9:41 PM
OSleger-WMF moved this task from Backlog to Tracking on the Content-Platform-Team board.May 14 2026, 2:25 PM
Raine renamed this task from Investigate Code 411 error when selecting zh-classical (lzh) language from article toolbar to Investigate Code 414 error when selecting zh-classical (lzh) language from article toolbar.May 18 2026, 12:08 PM
Raine added a comment.May 18 2026, 2:02 PM

This appears to be a problem with the Apache redirects, not with rest-gateway (IIUC, rest-gateway should not (and does not) serve lzh.w.o and does serve zh-classical.w.o correctly). Investigating.

Raine added a comment.May 18 2026, 4:27 PM

It appears that REST API redirects are broken for multiple wikis handled as redirects, but differently in different cases:

e.g. https://nrm.wikipedia.org/api/rest_v1/page/summary/Normaund works but the redirected (nrf => nrm) https://nrf.wikipedia.org/api/rest_v1/page/summary/Normaund returns a 500.

(Therefore, I assume nrf, if available in the Android app, would also be broken.)

Fun times!

cooltey edited projects, added: Wikipedia-Android-App; removed: Wikipedia-Android-App (Android Release - FY2025-26).May 18 2026, 8:27 PM
cooltey moved this task from Needs Triage to Tracking on the Wikipedia-Android-App board.
Raine triaged this task as Medium priority.May 19 2026, 12:24 PM

Changing priority to Medium as it is no longer affecting the Android app users thanks to the above hotfix. From the ServiceOps viewpoint, this has been broken for a while and is now affecting only API users *except* the android app (probably the biggest consumer).

Raine moved this task from Needs Info / Blocked to In Progress on the ServiceOps board.May 19 2026, 12:26 PM
Raine moved this task from In Progress to Scheduled (this Q) on the ServiceOps board.May 19 2026, 2:22 PM

IIUC, the PR merged above fixes this for the Android app. With that fix in place, this is only affecting API users that use the lzh domain in API calls, which is less than 1 in 1 million of total API calls, and those users are able to switch to using zh-classical. Thus, ServiceOps will for the moment prioritize higher priority tasks and will resume this later in the quarter as capacity allows. Please ping me if you disagree.

Raine added a project: User-Raine.May 19 2026, 2:22 PM
Raine moved this task from "Should I do it?" triage to Backlog on the User-Raine board.May 19 2026, 2:45 PM
MLechvien-WMF lowered the priority of this task from Medium to Low.Jun 1 2026, 9:29 AM
MLechvien-WMF moved this task from Scheduled (this Q) to Backlog on the ServiceOps board.Jun 30 2026, 8:09 AM
Phreelance subscribed.Mon, Jul 27, 9:12 PM

The same problem happens for zh-min-nan. The API call goes to nan.wikipedia.org and fails with a 414 error.

Restricted Application added a project: WikipediaApp. · View Herald TranscriptMon, Jul 27, 9:12 PM
Seddon moved this task from Backlog to App Experience on the WikipediaApp board.Tue, Jul 28, 2:08 PM
Seddon added a project: App Experience.
Phreelance added a comment.Tue, Aug 4, 10:42 AM

@Raine above you mentioned a hotfix for zh-classical – could the same hotfix be applied to zh-min-nan?

Raine added a comment.Tue, Aug 4, 11:37 AM
In T425545#12182590, @Phreelance wrote:

@Raine above you mentioned a hotfix for zh-classical – could the same hotfix be applied to zh-min-nan?

Yes, it will need to be done in the Android app. Tagging @cooltey as he handled the previous one.

cooltey created subtask T434037: Code 414 error when selecting zh-min-nan (nan) language from article list.Tue, Aug 4, 11:06 PM
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