fetch("http://localhost:8001/api/login", {
                        method: 'post',
                        headers: {
                            "Content-type": "application/x-www-form-urlencoded; charset=UTF-8"
                       },
                        body: 'username=' + this.state.username + '&password=' + this.state.password
                    })
                        .then(function (responseObject) {
                            console.log('Request succeeded with Response object', responseObject);

                        })
                        .then(function (result){
                            console.log(result);
                        })
                        .catch(function (error) {
                            console.log('Request failed', error);
                        });
                }else{
                    console.log('You must enter username, password.');
                }