In web applications the locale is inferred by default from the Accept-Language information that the browser sends. It does not contain information about script, calendar, collation, and so on.

If you want to use a different locale from the inferred locale, for example, a locale specified by corporate policies, the user’s explicit selection for the current section, from the previous session, or from the user’s registration profile, you must specify it by using IlvLocaleUtil.setThreadULocale(ULocale locale) for the duration of the current request. If the locale changes within a session, you might also have to call IlvLocaleUtil.setThreadULocale(ULocale locale) on the relevant web components.