Using "Accept-Language" redirects (like detecting zh-CN ) can be tricky for . Many AI bots send a default value of en-US,en;q=0.9 , which might accidentally trigger an English version of a site even if the bot is trying to index Chinese content.
Beyond basic web browsing, this specific string appears in technical documentation for: 0.9,zh-CN
The Unicode CLDR (Common Locale Data Repository) uses "coverage levels" to define how much data is available for a locale like zh-CN . A "Modern" level (Code 80) contains all fields in normal use, while "Comprehensive" (Code 100) covers even more. 3. Practical Impact for Developers 0.9,zh-CN