Почему запрос не срабатывает?

Question

[Wasya UK]

Когда делаю запрос через postman на https://ifyouhavemoneyforbitcoin.herokuapp.com, то получаю нормальный результат, но когда пытаюсь через axios

OPTIONS https://ifyouhavemoneyforbitcoin.herokuapp.com/ 404 (Not Found)
dispatchXhrRequest @ xhr.js:173
xhrAdapter @ xhr.js:18
dispatchRequest @ dispatchRequest.js:49
Promise.then (async)
request @ Axios.js:55
Axios.(anonymous function) @ Axios.js:74
...
localhost/:1 Failed to load https://ifyouhavemoneyforbitcoin.herokuapp.com/: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3001' is therefore not allowed access.

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3001' is therefore not allowed access.

Что я делаю не так?

axios
      .post('https://ifyouhavemoneyforbitcoin.herokuapp.com', { time: Date.now() })
      .then(({ data: bitcoin }) => {
        console.log("sdf", bitcoin);
        return bitcoin.cost
      })
      .then(bitcoin => {
        this.setState({
          data: addDataPoint(data, bitcoin, time)
        });
      })
      .catch(err => {
        console.error(err);
      });

Comments

[Wasya UK]

Немного поправил и одна ошибка пропала, но однако оно все же не работает

Failed to load https://ifyouhavemoneyforbitcoin.herokuapp.com/: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3001' is therefore not allowed access.

axios({
      method: 'post', //you can set what request you want to be
      url: 'https://ifyouhavemoneyforbitcoin.herokuapp.com',
      data: { time: Date.now() },
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
      }
    })
    .then(({ data: bitcoin }) => {
      return bitcoin.cost
    })
    .then(bitcoin => {
      this.setState({
        data: addDataPoint(data, bitcoin, time)
      });
    })
    .catch(err => {
      console.error(err);
    });

Answer 1

[qq1]

На чем написан ваш бэкенд? Нужно добавить поддержку CORS, гуглите по запросу %backend% enable CORS
Если на express то вот https://github.com/expressjs/cors