SAPUI5 'create' method get error with a status of 403(Forbidden)

Hello everyone,

I'm coding an sapui5 application with odata in eclipse that contain ‘create’,'update','delete' method.

But when I post the request,it show me the error:Failed to load resource: the server responded with a status of 403 (Forbidden)

Here are my code:

	var requestObj= {
		requestUri: "",
		method: "",
		headers: {
		"X-Requested-With": "XMLHttpRequest",
		"Content-Type": "application/atom+xml",
		"DataServiceVersion": "2.0",
		"MaxDataServiceVersion": "2.0",
		"Accept": "application/atom+xml"
		}
		};
	var newData = {
		"odata.type": "ZSFLIGHT_DETAIL_SRV.sflight",
		"Mandt": $("#mandt").val(),"Carrid": $("#carrid").val(),"Connid": $("#connid").val(),"Fldate": $("#fldate").val(),

	};



		var url = "proxy/http/DEWDFLSSC5445.emea.global.corp.sap:8000/sap/opu/odata/SAP/ZSFLIGHT_DETAIL_SRV/sflightSet";


		var method = "POST";

		var user = "****";
		var password = "*****";
		requestObj.requestUri = url;
		requestObj.method = method;
		requestObj.data = newData;
		requestObj.user = user;
		requestObj.password = password;


		OData.request(requestObj,function(){
		sap.ui.getCore().getModel().refresh();
		$("#formId").slideUp();
		});



	}

}