Set English as fallback default and negotiate page language from browser Accept-Language / navigator. | Dev Logs

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Date: 2026-01-10 22:45 Summary: Set English as fallback default and negotiate page language from browser Accept-Language / navigator.

[question] 设置英文为默认语言，并且判断浏览器可接受语言作为页面语言，网站没有对应语言则显示英文

[try to solve] Two-layer language selection:

Worker (dynamic routes)

Default fallback language English (SITE_DEFAULT_LANG=en).
For Worker-rendered HTML (e.g. tool routes), pick the best match from Accept-Language; if unsupported or disabled, fall back to English.

Static pages (home / devlogs)

Platform may serve static assets first, so every generated page injects an early <head> script that:
- Reads navigator.languages (or navigator.language) and picks the best site language;
- If the URL has no lang prefix and English is chosen, navigates to /en/...;
- Falls back to English when the browser language is not a site language.

[actions]

Updated: wrangler.jsonc (SITE_DEFAULT_LANG=en)
Updated: worker-configuration.d.ts (typegen)
Updated: src/index.ts (Accept-Language negotiation + English fallback for Worker HTML)
Updated: scripts/site/layout.mjs (client language auto-select/redirect script)
Updated: README.md
Regenerated static pages via build:site