https://issues.apache.org/bugzilla/show_bug.cgi?id=56848
Bug ID: 56848
Summary: Tomcat accept-language parsing doesn't properly handle
IETF BCP47 language tags
Product: Tomcat 7
Version: 7.0.55
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: do...@moonteeth.com
Microsoft started using IETF BCP 47 language tags in Windows 8, so for
languages such as Chinese Traditional (formerly zh-CN) and Chinese Simplified
(formerly zh-TW) the default language tags are now zh-hant-CN and zh-hans-TW
respectively.
The tomcat accept-language parsing method Request.parseLocalHeaders doesn't
handle these tags properly.
Here's the bcp 47 spec:
http://tools.ietf.org/html/bcp47
And here's a description of some of the changes in Java 7 for this:
http://docs.oracle.com/javase/tutorial/i18n/locale/create.html
Where Java 7 is involved, the Locale.forLanguageTag method
http://docs.oracle.com/javase/7/docs/api/java/util/Locale.html#forLanguageTag(java.lang.String)
works well assuming a fully compliant language tag. Perhaps Tomcat should try
to make use of this via reflection instead of parsing the entry? The grammar
for bcp47 tags doesn't make for easy parsing as various subsections of the tag
are only valid if they match to particular ISO codes.
see:
http://tools.ietf.org/html/bcp47#section-2.1
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