How to POST from another domain?

Question

Node.js

Can't POST from frontend app to server.
added

const cors = require('cors')
app.use(cors())

but still POST fails.

Answer 1

on server:

let corsOptions = {
    origin: 'http://front.xxx.ru',
    optionsSuccessStatus: 200, 
    credentials: true
};

app.use(cors(corsOptions));

and on the
angularjs 1.x purejs client

var xhr = new XMLHttpRequest();
xhr.withCredentials = true;

xhr.open('POST', 'http://xxx.ru', true)

jQuery

$.ajax({
   ///
    crossDomain: true,
  ///
});