Answers for "Access to XMLHttpRequest at 'http://restcountries.com/v3.1/all' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource."

Access to XMLHttpRequest at 'http://localhost:5000/mlphoto' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

var express = require('express')
var cors = require('cors')  //use this
var app = express()

app.use(cors()) //and this

app.get('/user/:id', function (req, res, next) {
  res.json({user: 'CORS enabled'})
})

app.listen(5000, function () {
  console.log('CORS-enabled web server listening on port 5000')
})

Access to XMLHttpRequest at 'https://hddn92.skylinewebcams.com/1071speed-1606566964102.ts' from origin 'https://www.skylinewebcams.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

XMLHttpRequest cannot load http://localhost:9200/_all. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9100' is therefore not allowed access.