Detele Records Using WEBAPI

Detele Records Using WEBAPI
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function DeteleRecord() {

    var lookup = Xrm.Page.data.entity.getId();
    var lookupID = lookup.replace('{', '').replace('}', '');
    var req = new XMLHttpRequest();
    req.open("DELETE", Xrm.Page.context.getClientUrl() + "/api/data/v9.1/new_testcrms(" + lookupID + ")", true);
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.setRequestHeader("OData-MaxVersion", "4.0");
    req.setRequestHeader("OData-Version", "4.0");
    req.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 204 || this.status === 1223) {
                alert("deleted record successfully..");

            } else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send();

}