GetLinkentitiesdetails Using WEBAPI

function GetLinkentitiesdetails() {

    var lookup = Xrm.Page.getAttribute("new_accounts").getValue();
    var id = lookup[0].id;
    id = id.replace('{', '').replace('}', '');
    var req = new XMLHttpRequest();
    req.open("GET", Xrm.Page.context.getClientUrl() + "/api/data/v9.1/new_testcrms?$select=_new_accounts_value,new_countries,new_dob&$expand=new_Accounts($select=createdon,name)&$filter=_new_accounts_value eq " + id + "", true);
    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=\"*\"");
    req.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 200) {
                var results = JSON.parse(this.response);
                for (var i = 0; i < results.value.length; i++) {
                    var _new_accounts_value = results.value[i]["_new_accounts_value"];
                    var _new_accounts_value_formatted = results.value[i]["_new_accounts_value@OData.Community.Display.V1.FormattedValue"];
                    var _new_accounts_value_lookuplogicalname = results.value[i]["_new_accounts_value@Microsoft.Dynamics.CRM.lookuplogicalname"];
                    var new_countries = results.value[i]["new_countries"];
                    var new_countries_formatted = results.value[i]["new_countries@OData.Community.Display.V1.FormattedValue"];
                    var new_dob = results.value[i]["new_dob"];
                    //Use @odata.nextLink to query resulting related records
                    var new_Accounts_NextLink = results.value[i]["new_Accounts@odata.nextLink"];
                    var name2 = results.value[0].new_Accounts.name;
                    var account1 = results.value[0].new_Accounts.createdon;
                }
            } else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send();


}