Commented Issue: exception while using AjaxFileUpload in a page containing a QueryString [27163]

add an ajaxFileUpload control in a page that required a query string
select a file and click upload

exception of type Uncaught Sys.ArgumentException: Sys.ArgumentException: Cannot deserialize. The data does not correspond to valid JSON.
Parameter name: data
is thrown

the request is ttp://localhost:63665/Form.aspx?q=SR-12-565?contextkey={DA8BEDC8-B952-4d5d-8CC2-59FE922E2923}&guid=A99A88EC-30F3-E51B-B070-E8EA45536537

in the source of the issue exists in AjaxFileUpload.pre line 176
this._webRequest.set_url(this._postBackUrl + '?contextkey=' + this._contextKey + '&guid=' + this._guid);

thanks
Comments: I've run into the same problem.