Unanswered question

Unknown Codes Found In Soap Request

Hi,
I encountered a problem, which the chinese character convert to the unknown codes like "?????" when submits the soap requests, I try many ways by myself, such as I changed the value of the http.querystring.encoding from utf-8 to GB2312, but not works. I attached one picture for your reference.
I would very much appreciate it if anyone could provide solutions on this.
thank you and best regards!

Robin L.
Robin L.

Robin L.

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