https://bz.apache.org/bugzilla/show_bug.cgi?id=70286
Bug ID: 70286
Summary: Locale parsing regression in Tomcat 11.0.27:
Accept-Language: zh-Hans-CN;q=1.0 produces wrong
toLanguageTag() output
Product: Tomcat 11
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: regression
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -------
I encountered a regression when upgrading to Tomcat 11.0.27. The HTTP header
Accept-Language: zh-Hans-CN;q=1.0 is parsed differently by Tomcat.
In version 11.0.26, the Locale object correctly contains:
language: zh
script: Hans
region: CN
locale.toLanguageTag() returns zh-Hans-CN
In version 11.0.27, the same header results in:
language: zh
region: CN
variant: HANS
locale.toLanguageTag() returns zh-CN-x-lvariant-HANS
This means the script tag Hans is mistakenly interpreted as a variant, which
breaks BCP 47 compliance and causes downstream code that relies on
toLanguageTag() to produce incorrect language tags.
Since 11.0.27, Request.getLocale() uses a new parser behavior in
https://github.com/apache/tomcat/commit/df9740fe4b
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