def http = new BasicHttp()
def postHeader = ['Content-Type': 'application/x-www-form-urlencoded']
def postBody = [
        grant_type: 'password',
        client_id: consumer_key,
        client_secret: consumer_secret,
        username: auth_username,
        password: auth_password
        ]
http.headers = postHeader;
http.verb ="POST";
http.payload =  JsonOutput.toJson(postBody);
http.url =sf_login_domain;
def res = http.send();