Date: 2026-09-03 21:15 Summary: Lang hint bar now uses the browser’s top supported preferred language, not the first language that differs from the page. Visibility: people
[question] chrome dev tool显示：accept language：zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7；为什么提示条显示检测到英语
[try to solve]
Context
Browser preference list is Chinese-first (zh-CN, zh, en-US, en), but the hint bar said it detected English.
Process
Inspected the client detector in both headers: it looped navigator.languages and picked the first enabled tag that was ≠ page language.
Root cause / analysis
On a Chinese page (data-page-lang=zh), zh-CN/zh matched the page and were skipped; the next supported tag was en → banner showed English. That is “first mismatch,” not “browser preferred language.”
Solution
Pick the first supported language from navigator.languages as preferred. Show the bar only when preferred !== pageLang; the message uses that preferred code. On /zh/ with zh-first Accept-Language, the bar no longer appears; on English / it offers Chinese.
Updated: scripts/site/components/header.mjs, src/pages/site/header.ts; rebuilt homes/tools; PAGES_CACHE_VERSION 4.12.
Notes / boundaries
Chrome DevTools “Accept-Language” request header and navigator.languages are usually aligned; detection uses navigator.languages (client). Clear oft_lang / oft_lang_hint_n if retesting the banner.
[actions]
- Fixed preferred-language detection; rebuilt site chrome and bumped cache to 4.12