'what does client.encoding.override do?

I have a jsp file in exDocRoot that accepts text input but when the inputted text is 2-byte character (ex:漢字) it becomes garbage

jvm.options setting:

-Dfile.encoding=Cp943C
-DextendedDocumentRoot=C:/exDocRoot

But when I added client.encoding.override in jvm.options the problem was fixed

updated jvm.options setting:

-Dfile.encoding=Cp943C
-Dclient.encoding.override=Cp943C
-DextendedDocumentRoot=C:/exDocRoot

I would like to know the reason how client.encoding.override fixed the problem. Will it have an effect in my other jsp files (display and input)?

jvm

Sources

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