URL encoding scheme that uses 3 digits?

I have a site that encodes URLs per RFC3987, and noticed some strange requests in my logs from http://image.baidu.com/i

The character ‘ä’ had been encoded as ‘%810%8A1’. (It should be ‘%C3%A4’ encoded per RFC3986 or ‘ä’ per RFC3987).

Does anyone know what encoding scheme this would be?

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