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How to get data via XMLHttpRequest using javascript

function getSearchResults ( searchString ) {     debugger;     var req = new XMLHttpRequest ();     var results;     req.open("GET", Xrm.Page.context.getClientUrl() + "/api/data/v9.1/ EntitysPlurualName ?$ select= Field1,Field2 &$filter= contains(productid/disc_codicepanthera,'" + searchString + "') or contains(productid/description,'" + searchString + "') or contains(productid/name,'" + searchString + "') or contains(productid/productnumber,'" + searchString + "' ) ", false);     req.setRequestHeader("OData-MaxVersion", "4.0");     req.setRequestHeader("OData-Version", "4.0");     req.setRequestHeader("Accept", "application/json");     req.setRequestHeader("Content-Type", "application/json; charset=utf-8");     req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");