URLDecoder works incorrectly in chinese GBK char with Internet Explorer

The chinese string "�u" should be normally encoded as "%AC%75" in GBK, but Internet Explorer encode it as "%ACu" according to '%75'=='u'.
When URLDecoder encounters url encoded by IE, it will decode '%AC' using gbk charset, and then append 'u' to the result above. So the final result is '?u', it cause a lot of problem to our application.
for a simple workaround, we use the code below instead of simply call URLDecoder.
new String(URLDecoder.decode("%ACu", "iso8859-1").getBytes("iso8859-1"), "gbk")
Is it a bug of URLDecoder?

According to your own description it is a bug in IE.

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URLDecoder works incorrectly in chinese GBK char with Internet Explorer

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