JSF doesn't check my browser "accept-language"

JWSDP 1.3, JSF 1.0 final, on Windows XP Chinese Version.

The "faces-config.xml":

...

<application>

<locale-config>

<default-locale>en</default-locale>

<supported-locale>zh</supported-locale>

</locale-config>

</application>

....

I put English and Chinese resource bundles to the proper directory. But i always get Chinese text output on the JSP page whatever browser & preferred langauge i choose. I've test IE to use "en_US" in a Chinese OS; an IE browser set to "en_US" on a English version OS; a English version Mozilla. I even captured the HTTP header and the request only contains "en_US" as accept language.

So what is going wrong with JSF engine? How does it determine user preferred langugage? Does it related to OS language version? I got confused.

[898 byte] By [sjtuzl] at [2007-9-30 4:18:10]