POST AJAX request denied - CORS?

Question

I have setup CORS on my node.js server on port 5000 as follows:

var app = express();

app.use(cors()); //normal CORS
app.options(\'*\', cors()); //preflight         


        

Answer 1

I've never used cors() so I can't speak to that piece. But you could manually allow cross origin resource sharing by setting up the node.js headers.

Add This Pre-Route on All Requests

app.route('*')
   .all(function(req, res, next) {
     res.header('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS');
     res.header('Access-Control-Allow-Origin', '*');
     res.header('Access-Control-Allow-Headers', 'X-API-TOKEN, Content-Type, Authorization, Content-Length, X-Requested-Wit
h');
   next();
})

This should work.

Answer 2

CORS doesn't work using the file protocol because there is no server there to send back the requisite headers. Your solution of using a server is the only way to get CORS to work.

Answer 3

This is the code I am using. It is located in my app.js file

app.all("/*", function (req, res, next) {

  res.header("Access-Control-Allow-Origin", req.headers.origin);
  res.header("Access-Control-Allow-Credentials",true);
  res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type,Accept,X-Access-Token,X-Key,Authorization,X-Requested-With,Origin,Access-Control-Allow-Origin,Access-Control-Allow-Credentials');
  if (req.method === 'OPTIONS') {
    res.status(200).end();
  } else {
    next();
  }
});

Answer 4

I have a project that use cors.

The node code used is just:

const cors = require('cors');
const express = require('express');
const app = express();

app.use(cors());

/* Connect/other routes here */

The jquery code look a litte different:

$.post('http://localhost:5000/connect', {}).done( () => {
  // Request complete
}).fail((jqXHR) => {
  // Request failed 
});