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We use URL master - URL rewriter. When we send a request of this format: TabId=2007&%u00d1%u0081%u00d1%u008b%u00d1%u0080%u00d1 , we can't seem to encode it properly, we get Giberish. We tried all encoding methods like UrlEncode etc.. The above string is in russian and is auto encoded when sent to the server on the query string.