How to deploy it?

[BorisBertelsen]

When I run npm run build and uploads the file to my FTP and attempts to login I get the following error:

Error: Request failed with status code 404
    at e.exports (createError.js:16)
    at e.exports (settle.js:17)
    at XMLHttpRequest.p.onreadystatechange (xhr.js:62)

xhr.js:177 POST http://MyDomain/login 404 (Not Found)

[AggelosM]

When I just npm start everything works correctly. But when I npm run build and serve -s build nothing works I always get

Cannot read property 'something' of undefined

I solved this by adding to App.js

import axios from 'axios';
axios.defaults.baseURL = "https://us-central1[...].cloudfunctions.net/api";

but now I'm getting a CORS issue which I don't know how to solve after trying many suggestions found online.

[AggelosM]

I solved the CORS issue by adding

const cors = require('cors');
app.use(cors());
app.options('*', cors())

to /functions/index.js
and also doing this because I deployed the functions on firebase.

[ghilasjku]

@Sp34k did you resolve your error, i have the same, if yes how ?