Calling Actions Using WEBAPI in Javascript

Calling Actions Using WEBAPI in Javascript
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function WebApiusingActions()
{
    debugger;
    var Gudid = Xrm.Page.data.entity.getId();
    Gudid = Gudid.replace('{', '').replace('}', '');
    //var parameters = {};
    var parameters = {};
    parameters.Countries = 2;
    var accounts = {};
    accounts.accountid = "9083FB80-8844-E211-979C-00155D2EE30B"; //Delete if creating new record
    accounts["@odata.type"] = "Microsoft.Dynamics.CRM.account";
    parameters.Accounts = accounts;
    parameters.Gendar = false;
    parameters.Personname = "TestingWEBAPI2";

    var req = new XMLHttpRequest();
    req.open("POST", Xrm.Page.context.getClientUrl() + "/api/data/v9.1/new_testcrms(" + Gudid + ")/Microsoft.Dynamics.CRM.new_TestActions", 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.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 204) {

                debugger;
                //Success - No Return Data - Do Something
            } else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send(JSON.stringify(parameters));
}