Do you use the right service in SharePoint 2013
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In SharePoint 2010, you can use SharePoint service /_vti_bin/listdata.svc to access data in SharePoint list, but in SharePoint 2013, /_vti_bin/listdata.svc has been officially deprecated.
The new service in SharePoint 2013 is /server/site/_api/web/lists/getbytitle('listname')
Read more about it on Determine SharePoint REST service endpoint URIs